10 bolt faq - S-10 Forum
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post #1 of 280 Old 08-25-2004, 10:36 PM Thread Starter
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7.5 10 bolt faq/setup/install

These rearends can hold up to 350-400HP as long as you DO NOT run slicks on them. There is some part numbers to help you get started. The biggest flaw with the 10-bolt design is the flexibility of the case. When under heavy load, the pinion walks up the ring gear face, and forces the case apart. This totally throws off the gear alignment which causes premature gear failure. One reason is due to the poorly designed crush sleeve by GM. Both of these can cause you to take teeth off of the ring and pinion gears. In order to build a sturdy 7.5 or 7.625 rearend that can take some abuse you need to start with A good set of gears. Do NOT buy a cheap set of gears, stick with quality set of GM, Richmond, US Gear, or Strange gears. Secondly buy a good posi unit like SLP, Auburn or Eaton. If you can try to stay away from spools since they put excessive strain on the axle ends and can break them. Weld the axles tubs all the way around the housing. GM only uses two small spot welds on each tube to hold them to the housing. This causes the tubes to flex under load. Welding them will help stop this. When you install your pinion gear throw away the cheap crush sleeve and buy a solid pinion support like the one from Ratech. After you have your pinion bolted up install your posi unit/gears and try to keep the gear mesh as tight as possible without running into problem like excessive gear noise. After thats done dont forget to finish it up with a nice strong support cover like the one from Summit or TA performance. A strong cover like these will help strengthen the case. A few more things to remember is that you can add a Zytanium cross pin. It is available in the year one next generation catalog. The stockers have a tendency to shear off. Dont forget to fill it back up with a good shockproof gear oil from redline or mobil 1. IF you follow this you can build a decently strong 10 bolt rearend. Remeber you need (1.) A good gear set (2.) a good posi unit (3.) pinion spacer instead of cruch sleeve (4.) good support cover (5.) weld axle tubes. The if you want you can add the Zytanium pin. I would not worry about breaking the stock axles, they are pretty strong. If you are worried you can buy a set of Moser's for around $300

P.S. I WROTE THIS FOR YOUR PERSONAL USE ONLY. I AM NOT LIABLE FOR ANYTHING THAT MAY HAPPEN TO YOUR REAREND. THIS IS MY PERSONNAL OPINION OF STRENGTHING A 10 BOLT WITH A BUDGET IN MIND. USE AT YOUR OWN RISK!

any questions feel free to PM me.....
------
www.Summitracing.com

MSR-9000 (Moser) Chevrolet: 10/12-bolt, 1.533 in. seat, C-clip eliminator kit
MSR-9100 (Moser) Chevrolet: 10/12-bolt, large bearing, 1.533 seat, C-clip eliminator kit
MSR-9200 (Moser) Chevrolet: 10/12-bolt, 1.400 in. seat, for stock axles, C-clip eliminator kit
RAT-108K (Ratech)GM: 1977-96 10-bolt, 7.5 in. and 7.625 in. ring gear, installation kit
RAT-3001K (Ratech)GM: 1980-up 10-bolt, 7.5 in. and 7.625 in. ring gear, deluxe installation kit
RAT-4111 (Ratech) GM: 10-bolt, 7.5 in., 8.2 in., differential, solid pinion bearing spacer with shim pack (Personal sidenote..This takes place of the origonal crushsleeve and helps stop the pinion from walking up the ring gear by giving it more support)
RMG-8310441 (Richmond)GM: 1982 to present, 10-bolt, 7.5 or 7.625 in., ring and pinion
installation kit
SME-8510400 (Summit)GM: 7.5 in., 10 bolt rear-end aluminum support cover
CNF-6086P (Con Ferr)Differential Cover, Aluminum, Polished, GM, 7 1/2 inch, 10-Bolt, Kit
ETN-19599-010 (Eaton)Differential, Posi Performance, Limited Slip, 28-Spline, GM/Honda/Izuzu, 7 5/8 in
ETN-19663-010 (Eaton)Differential, Posi Performance, Limited Slip, 26-Spline, GM, 7 1/2 in
-------
www.Jegs.Com

109-542040 (Auburn)88-Up, 3.23-Up GM 7-1/2'' & 7-5/8'' 10-Bolt, 28-Spline
109-542041 (auburn)88-Up, 3.08-Down GM 7-1/2'' & 7-5/8'' 10-Bolt, 28-Spline


92 S10 ex cab, 10.50's @ 130MPH, 1.50 60's 383, th350, 8.5 10 bolt. gone but not forgotten
01 S10 2.2, 5 speed, stepside, ZQ8, 2/3 drop, rollpan, cowl hood.

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post #2 of 280 Old 12-04-2004, 12:52 AM Thread Starter
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Re: 10 bolt faq

Thanks for the information HuTcH

Before you attempt doing this yourself, you need to read and decide if you are equipped, capable and willing. If not, you’ll save time, sweat and heartache if you pay a competent rear end professional to handle it. On the other hand, doing it yourself is the only way to really learn how.

Much of this information is applicable to differentials in general, but most is specific to the installation of the Zexel-Torsen limited slip carrier into GM 7.5” or 7.625” rear differentials with 3.23 or numerically higher gears and 28 spline axles. Most ’89 and up GM models have 28 spline axles. However GM did use a few leftover 26 spline axles after ’89, mostly in 2.2s and 2.8s. If your vehicle is near the ’89 changeover date check to be sure. If you have 26 spline axles you can purchase a set of 28 spline axles and still do the install.

Ok, are you ready to get sweat, greasy and possibly frustrated while installing your Zexel limited slip carrier, AKA Posi-Traction?

If so, loosen the 13mm-1/2” cover bolts and drain the gear oil into a suitable container. Jack or lift the rear end after loosening the rear wheel lug nuts. Securely support the vehicle as high as you can on appropriate jack stands. Remove the rear wheels. Remove the brake drums by tapping firmly around the rear edge while pulling outward.

Remove the differential cover and rotate the carrier until you have access to remove the 10mm-5/16” pinion shaft retaining bolt (use a 6 point socket to avoid rounding it off). You can now remove the pinion shaft that slides between the ends of the axles and keeps them from moving inward. Gently push one axle in to remove the large C-clip that secures the axle from moving outward. Carefully slide the axle out of the axle tube so as not to damage the outer axle bearing. Use a clean rag to wipe excess oil off as you withdraw it. Push in the other axle to remove it’s C-clip and carefully slide it out.

Since you have the axles out, go ahead and replace the axle oil seals located at the end of each axle tube. These seals are inexpensive and may start leaking as mileage increases. It’s easier to pull the seals out with a seal removal tool, but you can use the tip end of the axle. Be careful not to damage the bearings or sealing surfaces on the ends of the axle tubes. You’ll get a bit more differential fluid draining out of the axle tubes when you remove these seals. Be sure to collect it in your drain pan. If you have high mileage you should consider replacing the axle bearings also. You’ll need a slide hammer and a bearing removal tool that is able to pull from behind the seal. You may need to obtain the axle housing code to get the correct P/N seals and bearings. The axle housing code is stamped on the front of the passenger side axle tube, between the pumpkin and brake backing plate. Insert new seals and fully seat them by pounding them in flush with a large socket.

Ok! Back to the carrier removal. On each side of the carrier there is a main end cap secured over the carrier bearing races by two 16mm bolts. Mark the caps so they can be returned to their original location. Remove and set aside the four bolts and end caps. The carrier can now be removed from the differential housing, but first examine either end of the carrier and you will see shims wedged between the bearing races and differential housing. They are used to pre-load the carrier bearings and adjust the position of the ring gear for proper backlash.

Keep an eye on the shims when you pull the carrier out so you’ll be able to relocate them in their original locations. You will use these shims or new ones close to the same thickness as a starting point for proper backlash adjustment. If your rear end is in reasonably good shape, and you are just swapping in the Zexel carrier and using your old gears, you may get lucky and backlash will remain within the specification limits of .006” - .010”, but don’t count on it. That’s why you bought an install kit complete with varying thickness shims.

You’ll need a pry bar or bars and block of wood to coax the carrier out of the differential housing. You can use the 3lb. dead blow hammer or sledge to bang the carrier housing while you pry to get it started. Be careful not to damage the gasket-sealing surface of the differential housing or the ring gear. The bearing races, tapered metal rings that cover the carrier bearings, may fall off as the carrier comes out. They set over the bearings on either end of the carrier and are held in place when the carrier is installed and shimmed. You’re going to replace both of these inexpensive bearing races with new ones. Consider it cheap insurance to protect the like new bearings which are already pressed into both ends of the Zexel unit.

To transfer the ring gear YOU WILL NEED TO USE A BENCH VICE to hold it while you remove the 19mm-3/4" bolts that secure it to the OEM carrier. (*IMPORTANT NOTE: THESE BOLTS ARE REVERSE THREAD.) Cushion the carrier with a thick towel while mounting in the vice. If you haven’t removed the rectangular pinion block from the middle of the Zexel unit, do so now. This metal slab will slide in between the ends of the axles to keep them pushed out the same way the large cylindrical pinion shaft in the old carrier did. (NOTE: If you are running larger than 3.42 ring and pinion gears you may have to machine or file a couple grooves in the pinion block to slide it past the ring gear teeth later in the install procedure). Be sure to clean the ring gear and all bolts before installing it on the Zexel carrier. If the bolts are in good condition you can reuse them or use new high quality bolts. The old OEM bolts are better than cheap after market ones. Mount the Zexel into the vice and transfer the ring gear. Install the REVERSE THREAD 19mm bolts using Locktite and torque to 90ft.lbs. Torque the bolts in a couple stages while moving across and around the ring gear in a star pattern.

Now with the carrier out it’s time to thoroughly clean the differential housing. Remove gasket material from the sealing surface and wash out the housing with clean solvent. Check all of the oil passages and grooves to make certain that there are no metal particles or dirt remaining.

You’re now ready to install the Zexel carrier into the clean differential housing. Apply clean gear oil to both carrier bearings. You don’t need to pack them with grease. Position the carrier with the new bearing races in place and shim the left side first. While holding the assembly in place shim the right side (an assistant will make it easier).

Clean and re-install the two carrier end caps in their original location over the bearing races. Torque the 16mm bolts to 50-60ft.lbs. Use Locktite on all bolts in final assembly.

Now carefully slide the axles back in taking care not to damage the lips of the seal and insert the C-clip into the retaining groove. Pull the axle back out to seat the C-clip in the counter-bore of the side gear. Clean and insert the rectangular pinion block between the ends of the axles. Tap it in lightly to seat it, don’t force it. If it resist insertion pull the axles outward while rotating slightly back and forth to be sure they are seated correctly. Locktite and torque the retaining bolt. Rotate the drive shaft to make sure everything is meshed correctly and the assembly rotates smoothly.

Apply a thin bead of gasket sealing compound around the cover and position the gasket onto it. Install the cover with gasket and torque the 13mm bolts to 10-15ft.lbs, again moving in a side to side sequence around the cover. Fill the differential with fresh gear oil to the bottom of the fill hole. Check for any leaks around the differential. Re-mount the brake drums and wheels, lower the vehicle and go for a test drive. Check the differential fluid level again on level ground after your test drive since some of the gear oil may have flowed back into the axle tubes. Congratulations, you now have two legs!

92 S10 ex cab, 10.50's @ 130MPH, 1.50 60's 383, th350, 8.5 10 bolt. gone but not forgotten
01 S10 2.2, 5 speed, stepside, ZQ8, 2/3 drop, rollpan, cowl hood.

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Re: 10 bolt faq

Thanks for the information HuTcH

It details how to check and adjust for proper setup:

Here is some basic differential terminology you should learn.
Flank – the bottom area of the ring gear that the gear teeth rise from. Also called the root
Face – the top flat surface of each gear tooth also called the top land
Drive – the convex side of the ring gear teeth which the pinion contacts to drive the ring gear
Coast – the concave side of the ring gear teeth opposite the drive, also contacted by pinion gear
Heel – the outer edge of the ring gear
Toe – the inner edge of the ring gear
Pinion depth – the position at which the pinion contacts the ring gear teeth between the face and flank
Pattern – the “footprint” where the pinion gear contacts the drive and coast sides of the ring gear teeth (viewed by use of gear marking compound)
Backlash – the amount of free movement of the ring gear with the pinion held fixed in place
Pre-load – the initial amount of force applied to the races upon the bearings

When working on a differential there are four basic adjustments. In order of importance they are:
1. Pinion Depth
2. Pinion Bearing Pre-load
3. Backlash
4. Carrier Bearing Pre-load
Be aware that adjustments of pinion depth, pre-load and backlash effect each other. When you change one you must re-check the others. Therefore it’s important to understand that for a correct install you may have to remove the carrier several times to make the necessary adjustments, indicated by the pattern and backlash measurements, to achieve proper alignment.

Before you can adjust pinion dept you must set backlash. The best way to obtain backlash reading is with a dial indicator. You should be able to get a close indication of initial pinion depth if the backlash is within, or very close to the .006” - .010” specification. On most ring and pinion sets backlash will change about 0.007” for each 0.010” that the carrier is moved. Therefore if you need to decrease the backlash by 0.007”, move the carrier 0.010” closer to the pinion by shimming the left side. If you need to increase the backlash by 0.007”, move the carrier 0.010” farther away from the pinion by shimming the right side. Use a pencil and paper to keep notes of shim combinations and backlash. A calculator might also come in handy.

After setting the backlash you can check pinion depth. Do this by brushing three or four of the ring gear teeth with a moderate coat of compound in two locations on the ring gear. Rotate the ring gear past the pinion gear four or five times to print a good pattern. The gear marking compound will show a clear pattern of pinion contact on the ring.

The pattern you’re looking to achieve should be oval in shape and centered between the face and flank on the drive and coast side of the ring gear teeth. There should be an area of no contact below the face and above the heel on both sides. It would be ideal if the pattern was also centered between the heel and toe of the ring gear, but that is not necessary. The only part of the pattern that helps set the pinion depth correctly is the contact position between the face and flank of the teeth, regardless of the location concerning heel and toe. I’ll say it again; if the contact pattern is towards the heel or the toe of the ring gear teeth ignore that and look only at the position from face to flank. In most cases an ideal heel to toe pattern can not be achieved anyway. Trying to make adjustments to get a pattern that is centered from heel to toe will usually lead to frustration and a noisy gear set. The position of the pinion bearing bore in the housing and housing alignment affects the pattern from heel to toe and can not be corrected without machine work. So once again, a contact pattern that is centered from face to flank on the drive and coast side always indicates correct pinion depth even if the pattern can’t be centered from heel to toe.

If the contact pattern is towards the face of the ring gear teeth then the pinion is too far away from the ring gear. To correct it the pinion needs to be moved towards the ring gear with a thicker shim to position it closer to the ring gear centerline. If the contact pattern is towards the flank of the ring gear teeth then the pinion is too close to the ring gear. To correct it the pinion needs to be moved away from the ring gear centerline with a thinner shim. The shim is located between the gear and rear bearing.

If the backlash is within spec but the pinion depth is not correct you match-mark the driveshaft to the pinion flange and remove the driveshaft and suspend it with wire out of the way on something like the exhaust pipe. Match-mark the pinion flange, pinion shaft and nut (if you’re reusing the nut). Now check the bearing pre-load using an inch-pound torque wrench and record it before disassembly. The pre-load is the torque required to just begin turning the pinion shaft.

To remove the pinion nut and washer you will need to use a special flange holding tool or breaker bar to hold the flange in place while you loosen the nut. You may also want to install the cover loosely with a couple bolts so the pinion doesn't fall out. With the nut and washer off use a two-jaw puller to withdraw the flange by placing the two jaws on the backside of the flange and the puller screw on the pinion. Examine the sealing surfaces of the flange for nicks or gouges. Replace the flange if it's damaged. Use a blunt chisel to remove the pinion oil seal, being careful not to damage the carrier housing. The pinion can now be removed from inside the carrier case to replace the bearings, races, correct thickness shim and crush sleeve. It’s easiest to assemble the pinion without a crush sleeve until the correct pinion depth has been established. Install the new pinion oil seal. When initially installing the pinion slowly tighten the pinion nut until the pre-load is within the assembly specifications of 12-15 in. lbs. on a new pinion gear and 6-7 in. lbs. on a used pinion.

Understand this is the hard way to set pinion depth without the six or seven special jigs, and guage a GM tech has available. They can simple install the various jigs and get a reading on the guage that translates into the correct thickness shim required.
When changing the pinion depth always make large changes until the pattern is close. Consider 0.005” to 0.015” to be a large change and 0.002” to 0.004” to be a small change. Changes of 0.005” to 0.008” or more will lead to the correct pattern faster than small changes will. If you move the pinion too far and the pattern changes from one extreme to the other then you know that the correct pattern is somewhere between the two extremes. Once you get close to the correct pinion depth make smaller changes until the pattern is centered between the face and the flank of the ring gear teeth. After the backlash and pinion depth are set remove the carrier and set the final pinion bearing pre-load of 12-15 in. lbs. on new pinion gear and 6-7 in. lbs. on a used pinion. Use a new crush sleeve for final assembly. Use oil on the pinion nut washer surface during all assemblies and red Loctite on the pinion nut threads during the final assembly. The oil on the washer surface helps the nut turn easier while it is being tightened and the red Loctite helps keep it tight.

On a crush sleeve design differential it usually takes between 300 and 400 foot pounds of torque to crush the crush sleeve. Use a large breaker bar and or very strong air operated impact wrenches to crush the crush sleeve. Proceed very slowly so that you get it right the first time. The pinion preload will be zero until the bearings contact the races. When the bearings contact the races the preload will increase very quickly. Take plenty of time to set the preload carefully so that the bearings will have a long life. If the crush sleeve is over crushed and the pinion bearing preload exceeds the specified allowable range the only solution that I know of is to install another new crush sleeve and start over. After reaching the correct pre-load, moderately tap both ends of the pinion to seat the bearings, races and yoke. Be careful not to hit the pinion so hard that it damages the bearings. After “seating” the pinion check the pre-load again to make certain that it is correct.

After setting the pinion depth, backlash, and pinion bearing pre-load it’s time to set the carrier bearing pre-load. During the original set-up you set the backlash with very little carrier bearing pre-load. Now set correct pre-load by inserting equal thickness shims to each side. Make it fairly tight, as tight as you can without damaging the shims while driving them in. If the pre-load is close and the backlash is wide, add shims to the left side. This increases the carrier bearing pre-load and decreases the backlash at the same time. If the pre-load is close and the backlash is too tight, add shims to the right side. This increases both the carrier bearing pre-oad and the backlash at the same time.

Now that the pinion depth, pinion bearing preload, backlash, and carrier bearing preload are set recheck the pattern once more to be certain that everything is perfect before final assembly.

All new gear sets require a break-in period to prevent damage from overheating. After driving the first 15 or 20 miles it is best to let the differential cool before proceeding. 500 miles are recommended before towing. Tow for very short distances (less than 15 miles) and letting the differential cool before continuing during the first 45 towing miles. This may seem unnecessary but many differentials are damaged from being loaded before the gear set was broken-in. It's also recommended to change the gear oil after the first 500 miles. This will remove any metal particles or phosphorus coating that has come from the new gear set.

92 S10 ex cab, 10.50's @ 130MPH, 1.50 60's 383, th350, 8.5 10 bolt. gone but not forgotten
01 S10 2.2, 5 speed, stepside, ZQ8, 2/3 drop, rollpan, cowl hood.

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post #4 of 280 Old 08-07-2005, 01:22 AM Thread Starter
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Re: 10 bolt faq

i opened this thread for anybody that has any questions on any type of rearend problems, rearend swaps, etc. This can be for a 7.5 10 bolt, 8.5 10 bolt, 12 bolt, 9", etc. PLEASE DO NOT WHORE THIS THREAD OR YOUR POST WILL BE DELETED. This is designed to help everyone. I deciede instead of answering question from PM's id rather answer them here incase anyone else has a similar problem.

92 S10 ex cab, 10.50's @ 130MPH, 1.50 60's 383, th350, 8.5 10 bolt. gone but not forgotten
01 S10 2.2, 5 speed, stepside, ZQ8, 2/3 drop, rollpan, cowl hood.

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Re: 10 bolt faq

which in your opinnion would be the best choice. upgrade my 75/8 or spend the extra and buy a 8.5 posi w disc brakes from a blazer. i am getting a 4.3 automatic and want to eventully drag it w/ slicks. and if i get a 5 spd 4.3 it already has a 8.5 correct? just not disc brakes (truck).
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Re: 10 bolt faq

Not all 4.3's with a 5 speed come with a 8.5 bolt, Only some of the newer ones do. If you are going to stay with a 4.3 i would say to keep the 7.625 and upgrade it with a nice posi, gears, and support cover. Upgrading to a 8.5 is expensive and not worth it unless it is necessary. Most 8.5's run $500 and up without disk brakes. For $500 you can pick up a auburn or eaton posi, gears, and a cover. Keep an eye out on ebay also. I built one of my 7.5's with OEM used gears off ebay, used auburn posi off ebay, and used support cover for less then $300 and it held up great.

92 S10 ex cab, 10.50's @ 130MPH, 1.50 60's 383, th350, 8.5 10 bolt. gone but not forgotten
01 S10 2.2, 5 speed, stepside, ZQ8, 2/3 drop, rollpan, cowl hood.
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Re: 10 bolt faq

Ok I was pricing some 8.5's for my Blazer and got quoted $700 - $1000 click here for details about the damage I have done to my truck.
I have aready replaced the rear U joint, but I still don't feel safe driving it. I want to drive the truck a.s.a.p. and was wondering is it worth swapping in any thing that will work temporarily while I rebuild my rear end as strong as I can.

Quote:
1st ever time slip (in the Blazer) = 15.998 @ 85.46MPH...
Faster than my buddies sport compact that day
Driving like that is how I broke the tranny, and rear end(s)

M & G Customs <---Click here
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post #8 of 280 Old 08-08-2005, 10:32 PM Thread Starter
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Re: 10 bolt faq

i would say call up a junkyard and get another 7.5 with an open rear and drum brakes. You could probally get one for a few hundred if that.

92 S10 ex cab, 10.50's @ 130MPH, 1.50 60's 383, th350, 8.5 10 bolt. gone but not forgotten
01 S10 2.2, 5 speed, stepside, ZQ8, 2/3 drop, rollpan, cowl hood.
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post #10 of 280 Old 08-10-2005, 10:40 PM
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Re: 10 bolt faq

Quote:
Originally Posted by zerogravity58
i would say call up a junkyard and get another 7.5 with an open rear and drum brakes. You could probally get one for a few hundred if that.
I thought I had the 8.5 But I don't know. will any kind bolt up or do I need to get one for a manual tranny. I thought I read they were different somewhere.

Quote:
1st ever time slip (in the Blazer) = 15.998 @ 85.46MPH...
Faster than my buddies sport compact that day
Driving like that is how I broke the tranny, and rear end(s)

M & G Customs <---Click here
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post #11 of 280 Old 08-13-2005, 05:12 PM
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Re: 10 bolt faq

Quote:
Originally Posted by zerogravity58
i would say call up a junkyard and get another 7.5 with an open rear and drum brakes. You could probally get one for a few hundred if that.
Ok just to be clear, I can grab any year S-10 2wd drum brake rear end and bolt up and go. Or I can swap my rear discs over in the meantime until I rebuild my 8.5

Quote:
1st ever time slip (in the Blazer) = 15.998 @ 85.46MPH...
Faster than my buddies sport compact that day
Driving like that is how I broke the tranny, and rear end(s)

M & G Customs <---Click here
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post #12 of 280 Old 10-07-2005, 11:39 AM
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Re: 10 bolt faq

Ok, this one is for the techincally unsavvy. For those of us with 98-2003/4 4.3L S10's with the One Wheel Wonder rear ends, could you post a parts list of exactly what we need. I think most of us would prefer to buy an entire kit rather than all the parts to put it together. Or would it just be easier to get a Posi rear end from the junkyard and swap it out. Remember, we suck at tech talk and are slow, well, I am at least.
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Re: 10 bolt faq

im not sure if they make an entire kit, but even if they do they will stick you $$$ for it. This is what you need if you want to change gear you would need to buy gears for a 7.5 10 bolt with a 3 series carrier( anything 3.08 and lower uses 3 series carrier so 3.08, 3.42, 3.73, 4.10, 4.56, etc are 3 series.) Then you would need to get a carrier for a 7.5 10 bolt with 28 spline axles. You would also need a gear/carrier install kit which comes with shims, crush sleeve, pinion nut, etc to intstall everything. A new set of gears will run you around $200, new carrier $300, install kit $75 or so. But keep an eye on ebay i built a 7.5 one time for $200. I bought a posi off ebay with 5,000 miles on it for $100, 3.73 gear with 5,000 miles for $50, and a install kit for $50 and it worked great. any othert questions let me know. YOu should check and make sure you do not have a 8.5 also, you would only have one if you have a 4.3/5 speed

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post #14 of 280 Old 10-07-2005, 10:50 PM
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Re: 10 bolt faq

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Originally Posted by zerogravity58
im not sure if they make an entire kit, but even if they do they will stick you $$$ for it. This is what you need if you want to change gear you would need to buy gears for a 7.5 10 bolt with a 3 series carrier( anything 3.08 and lower uses 3 series carrier so 3.08, 3.42, 3.73, 4.10, 4.56, etc are 3 series.) Then you would need to get a carrier for a 7.5 10 bolt with 28 spline axles. You would also need a gear/carrier install kit which comes with shims, crush sleeve, pinion nut, etc to intstall everything. A new set of gears will run you around $200, new carrier $300, install kit $75 or so. But keep an eye on ebay i built a 7.5 one time for $200. I bought a posi off ebay with 5,000 miles on it for $100, 3.73 gear with 5,000 miles for $50, and a install kit for $50 and it worked great. any othert questions let me know. YOu should check and make sure you do not have a 8.5 also, you would only have one if you have a 4.3/5 speed
for that kind of money and work you would be better off to get moser on the horn and order a 12 bolt for $1700 with 36 spline axles that would be strong if you plan to up the HP later on.

Last edited by bww3588; 10-07-2005 at 10:52 PM.
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post #15 of 280 Old 10-08-2005, 01:31 AM
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Re: 10 bolt faq

I swapped in a 7.5 or whatever drum rear end. it works. flushed fluid and now I stop better. cant wait till I get my locker in my 8.5 and my dicsc back. hole in my rear cover and this rear end is 1 inch shorter.

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post #16 of 280 Old 10-08-2005, 06:56 AM
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Re: 10 bolt faq

Actually, the 3.08 and NUMERICALLY LOWER..which means, 3.08, 2.73 etc are on a series 2 carrier...the 3 series is for any gear numerically higher than a 3.08..ie 3.23, 3.42,3.73, etc..

You can use a series 2 carrier with the 3.23+ gears, but you would need to buy the spacer or run an aftermarket gearset like richmond.

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post #17 of 280 Old 10-09-2005, 02:34 AM
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Re: 10 bolt faq

so i got a 92 2wd reg cab with 3.08 open rear end. and i bought a locker and a set for 4.10 gears out of a 2000 model camro would they work in my truck. u got one sayin yes and one sayin no so which one is it.
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post #18 of 280 Old 10-09-2005, 01:30 PM
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Re: 10 bolt faq

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so i got a 92 2wd reg cab with 3.08 open rear end. and i bought a locker and a set for 4.10 gears out of a 2000 model camro would they work in my truck. u got one sayin yes and one sayin no so which one is it.
no they wont. first of all the carrier is different for the 3.08 then the 4.10 camaro. and the locker and gearset for the camaro has 28 spline axles and our s10s have 26. the 92 s10 rear is 7.5 in ring and the 00 camaro is a 7.625 ring.
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post #19 of 280 Old 10-14-2005, 03:27 PM
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Re: 10 bolt faq

i am going to go look at a couple of rear ends tommorow, they are both out of the truck, is there easy way to check the gear ratio?
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Re: 10 bolt faq

not that i know of
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post #21 of 280 Old 10-14-2005, 05:05 PM
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Re: 10 bolt faq

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i am going to go look at a couple of rear ends tommorow, they are both out of the truck, is there easy way to check the gear ratio?
Ring gear teeth divided by pinion gear teeth. Or support the rear on jackstands and rotate the axle on complete revolution and count the number of revolutions on the pinion yoke. i.e. One rotation on the axle and you notice about 3 and 3/4 on the pinion, you have a 3.73 gear ratio.
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post #22 of 280 Old 10-14-2005, 05:31 PM Thread Starter
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Re: 10 bolt faq

also there should be a tag somewhere on the rearend. usually it is on one of the bolts holding the cover one or it maybe wrapped around a brake like close to the cover. It will tell you what gears are in the rearend.

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Re: 10 bolt faq

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Ring gear teeth divided by pinion gear teeth. Or support the rear on jackstands and rotate the axle on complete revolution and count the number of revolutions on the pinion yoke. i.e. One rotation on the axle and you notice about 3 and 3/4 on the pinion, you have a 3.73 gear ratio.
Thanks, is there a good oil or additive i can use that is better for the govloc, this will be my third rear end in 1 year! the first one i broke some teeth off the pinion gear and the pieces shot through the cover and i lost my oil down the highway, and the one in there now i broke something in the posi because it's only one tire fire in the rain or other slippery stuff, and there was some serious metal stuck to the magnet(fuzzy with 1/2"> chunks of what looked like a posi disk?) any ways it makes some pretty awfull noises. I dont know if they were just weak or i was to hard on them or what. i used pennzoil 75w90 in them. any one else going through an excessive amount of rear ends?
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Re: 10 bolt faq

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Thanks, is there a good oil or additive i can use that is better for the govloc, this will be my third rear end in 1 year! the first one i broke some teeth off the pinion gear and the pieces shot through the cover and i lost my oil down the highway, and the one in there now i broke something in the posi because it's only one tire fire in the rain or other slippery stuff, and there was some serious metal stuck to the magnet(fuzzy with 1/2"> chunks of what looked like a posi disk?) any ways it makes some pretty awfull noises. I dont know if they were just weak or i was to hard on them or what. i used pennzoil 75w90 in them. any one else going through an excessive amount of rear ends?
i used royal purple synthetic gear oil in mine. havent heard a whimper.
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post #25 of 280 Old 10-15-2005, 12:01 AM Thread Starter
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Re: 10 bolt faq

sorry to tell you but the factory govlocs are the biggest pieces of crap. If i were you i would keep the rearend you have and rebuilt it. seals, bearings, and a good posi unit and you wont have to worry about it again.

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post #26 of 280 Old 10-15-2005, 12:18 PM
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Re: 10 bolt faq

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sorry to tell you but the factory govlocs are the biggest pieces of crap. If i were you i would keep the rearend you have and rebuilt it. seals, bearings, and a good posi unit and you wont have to worry about it again.
I know i should build one, but i find shit allways brakes when ur broke. The rear ends are only costing $50-$150, so thats what makes up my mind. Also one of my axle tubes cracked where the spring perch is, and i broke a spring, so it has to come out anyway. Perhapes on day i'll do it right, but for now $50 is a cheap fix.
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post #27 of 280 Old 10-16-2005, 09:48 PM
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Re: 10 bolt faq

ok so i got a 3.73 posi for $50 springs included, on my 87' dime i have a spring pack with 4 on each side, but on leaf broke. The new rearend has spring packs with only 2 leafs, should i go with 2 leaf on each side, or stick with my 4 packs with a broken leaf? which is better?
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post #28 of 280 Old 10-16-2005, 10:10 PM
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Re: 10 bolt faq

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ok so i got a 3.73 posi for $50 springs included, on my 87' dime i have a spring pack with 4 on each side, but on leaf broke. The new rearend has spring packs with only 2 leafs, should i go with 2 leaf on each side, or stick with my 4 packs with a broken leaf? which is better?
anything that is in good woking condition is better than somthing with a piece broken. if you can fix your leaf in the 4 pack stick with it. it will give you a higher load capacity. but if your not planning to pack anything around in it stay with the 2 pack. it will give you a better ride but worse handling. heres my take. get the 2 pack. this will lower your ride. get a ZQ8 sway bar, and new stiffer shocks for the back. however since you dont have the factory ZQ8 susp. this will take the unevenness out of your truck. it will be level from front to back. but you might aswell forget about carrying anything over an entertainment center.
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post #29 of 280 Old 10-16-2005, 10:14 PM
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Re: 10 bolt faq

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Ok, this one is for the techincally unsavvy. For those of us with 98-2003/4 4.3L S10's with the One Wheel Wonder rear ends, could you post a parts list of exactly what we need. I think most of us would prefer to buy an entire kit rather than all the parts to put it together. Or would it just be easier to get a Posi rear end from the junkyard and swap it out. Remember, we suck at tech talk and are slow, well, I am at least.
it would be alot easier and cheaper to go to a junkyard and get a rear out of a 2002 or newer 2wd 4.3 5 spd blazer. this rear is 8.5 and has disk brakes. for about 600-1000 depending on cond and milage and your boneyard, this is a helluva upgrade.
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post #30 of 280 Old 10-16-2005, 10:41 PM
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Re: 10 bolt faq

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anything that is in good woking condition is better than somthing with a piece broken. if you can fix your leaf in the 4 pack stick with it. it will give you a higher load capacity. but if your not planning to pack anything around in it stay with the 2 pack. it will give you a better ride but worse handling. heres my take. get the 2 pack. this will lower your ride. get a ZQ8 sway bar, and new stiffer shocks for the back. however since you dont have the factory ZQ8 susp. this will take the unevenness out of your truck. it will be level from front to back. but you might aswell forget about carrying anything over an entertainment center.
Well i guess i should fix my 4 pack, because i have a 16ft boat i haul around, plus it's more of a work truck. Maybe i can put the two packs together and make something that will work. I'm planning on selling my trucks (87' s10 4x4, 89' Chev 1500 2wd) and getting something else, maybe a newer Zr2.
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post #31 of 280 Old 10-16-2005, 10:52 PM
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Re: 10 bolt faq

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Well i guess i should fix my 4 pack, because i have a 16ft boat i haul around, plus it's more of a work truck. Maybe i can put the two packs together and make something that will work. I'm planning on selling my trucks (87' s10 4x4, 89' Chev 1500 2wd) and getting something else, maybe a newer Zr2.
new ZR2's are bad ass. they already have the 8.5 posi rear i beleive 3.73, sway bars, staggered shocks, disk brakes beautiful setup.
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post #32 of 280 Old 10-19-2005, 09:28 PM
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Re: 10 bolt faq

another option is the *gasp ford 8.8. i got mine out of a 95 explorer with 3.73 posi,torque arms, sway bar and disc brakes with only 86,000 miles for $300. the stock leaf springs will bolt right up with about .5 inch of prying. i welded up the axle tubes, painted on some por-15, slapped on a trick flow cover and bolted it up to some new drop leaves. i couldnt believ how much beefier it was then the 10 bolt i took out.
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post #33 of 280 Old 11-11-2005, 02:33 PM
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Re: 10 bolt faq

so will the 2ng gen bolt right into a 1st gen? are there parts available for the 8.5 to upgrade? does the 8.5 have a stock posi unit or will one still be needed? i am planning to swap in an lt1 and it will get sprayed and will use stick tires to play. it would be nice to have rear disks, plus upgrade to the blazer front brakes.

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post #34 of 280 Old 11-11-2005, 07:43 PM Thread Starter
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Re: 10 bolt faq

i spray mine and run slicks on it. The 8.5 is comparable in strength to a 10 bolt. There are plenty of upgrades for the 8.5. Some come with posi some dont, some also come with disk brakes and some dont.

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post #35 of 280 Old 11-12-2005, 01:28 AM
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Re: 10 bolt faq

but the rear is aa lt in correct? same width and perch mounts? is there anyway to tell which one has the posi and which ones come with the 8.5, like years, and is it all blazers for the certain years? thanks?

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post #36 of 280 Old 11-12-2005, 05:27 PM
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Re: 10 bolt faq

mine s10 came with a 8.5 but has drums on it. gona swap out and get 3.73s

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post #37 of 280 Old 11-13-2005, 11:35 AM Thread Starter
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Re: 10 bolt faq

the only way to tell them apart is by look at the inspection cover. 8.5 has a perfect round cover where the 7.5 is more square.

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post #38 of 280 Old 11-13-2005, 06:18 PM
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Re: 10 bolt faq

yup, i have a gasket for each one but my camera isnt working there is a hugh difference in the two. mine has the 3.08 with the eaton locker so im goning to put 3.73 and disk swap

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post #39 of 280 Old 11-13-2005, 06:59 PM
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post #40 of 280 Old 11-23-2005, 10:38 PM
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Re: 10 bolt faq

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no they wont. first of all the carrier is different for the 3.08 then the 4.10 camaro. and the locker and gearset for the camaro has 28 spline axles and our s10s have 26. the 92 s10 rear is 7.5 in ring and the 00 camaro is a 7.625 ring.
Your post is a bit off....and while it sounds like you have the basics, you don't know the details.

The 4.10 gear would work on a series 2 carrier, but a spacer would be needed...but it would work. Newer S10's [years 91+] carry 28 spline axles and the 7.5 and 7.625 gears are interchangable...The 7.5 gears are easier to setup due to less pitch in the teeth, and are more advisable to run for newbies setting up rears, but the 7.625 are quieter due to the tighter backlash [.003-.006"] than the 7.5 gears.

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post #41 of 280 Old 11-24-2005, 02:11 PM
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Re: 10 bolt faq

Just a quick question... I shouldn't have any problem putting a 84' Blazer rear end in my 87' S10 PU should I? They are both 4x4. I'll make sure the blazer has the right ratio too.
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post #42 of 280 Old 11-24-2005, 08:43 PM
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Re: 10 bolt faq

ok my uncle has a blazer rear with disc brakes 3.73 gears... was just wondering what it would take to swap it into my 96 ss??? are all blazer rears 8.5 or what

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post #43 of 280 Old 11-24-2005, 09:42 PM Thread Starter
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Re: 10 bolt faq

if they are both 2wd then it is a direct bolt in except you may have to shorten the driveshaft. If one is 2wd and the other 4wd then it is still a direct bolt in except you will need wheels with a diffrent backspacing

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post #44 of 280 Old 11-24-2005, 10:50 PM
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Re: 10 bolt faq

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if they are both 2wd then it is a direct bolt in except you may have to shorten the driveshaft. If one is 2wd and the other 4wd then it is still a direct bolt in except you will need wheels with a diffrent backspacing
why would you have to shorten the DS? they are the same rearend.
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post #45 of 280 Old 11-24-2005, 10:52 PM Thread Starter
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Re: 10 bolt faq

the 7.5 and 8.5 are not the same rearend. The 8.5 is longer then the 7.5

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post #46 of 280 Old 11-24-2005, 11:20 PM
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Re: 10 bolt faq

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the 7.5 and 8.5 are not the same rearend. The 8.5 is longer then the 7.5
i think its the same. s10warehouse claims they are a direct bolt in. see if he knows.
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post #47 of 280 Old 11-24-2005, 11:31 PM
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Re: 10 bolt faq

The 8.5 rear has a deeper pinion, which ends up being around an inch farther foward compared to the 7.5 IIRC.

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post #48 of 280 Old 12-05-2005, 11:06 AM
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Re: 10 bolt faq

didnt know where to put this so....here it goes...

my and a friend are doing some swaping for some parts, and im getting a 99 blazer rear end out of it, i wanna go ahead and put a new gear in it.....what would the stock gear ratio be? what would be a good ratio to go to?

also, since its gonna be out and i am planing to throw a v8 in my truck should i go ahead and upgrade axels? any thoughts?

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post #49 of 280 Old 12-05-2005, 09:34 PM Thread Starter
FWD's suck
 
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Re: 10 bolt faq

i wouldnt worry about the axles the axles are not the weak parts in these rearends. If you doing a v8 swap id upgrade to a good posi unit and a good set of 3.73's or 4.10's. ALso buy a support cover and the rear should last you awhile as long as you dont throw slick on it.

92 S10 ex cab, 10.50's @ 130MPH, 1.50 60's 383, th350, 8.5 10 bolt. gone but not forgotten
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post #50 of 280 Old 12-05-2005, 10:41 PM
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Re: 10 bolt faq

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Originally Posted by zerogravity58
i wouldnt worry about the axles the axles are not the weak parts in these rearends. If you doing a v8 swap id upgrade to a good posi unit and a good set of 3.73's or 4.10's. ALso buy a support cover and the rear should last you awhile as long as you dont throw slick on it.


what posi would you suggest?

so you dont think i will need the axels?

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When I think of MoneyMike I think of Denis Leary singing "Asshole"

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