10 bolt faq

[Chris0nllyn]

i see a few of you are from MD...zerogravity and lenny95neon, theres a meet comin up in southern MD...check out the thread
http://www.s10forum.com/forum/f92/so...r-meet-315064/

[zerogravity58]

Got to work that day or id try and make it....

[mstngsrule68]

i got a complete set of 3.23 7.5" for sale. only want 50$

[devil boy]

I have a question concerning the C-clip eliminator part #'s listed in the first post. Which size would fit a stock 2003 2.2l S-10? Would it be the MSR-9200?

[The Griff]

throwing up another question.

I have the Gm 7.5 10 bolt With the open 3:08 and want 3:42's or 3:73's. I know I cant just buy a carrier and have someone install it, what else do i need?

[zerogravity58]

Quote: Originally Posted by devil boy

I have a question concerning the C-clip eliminator part #'s listed in the first post. Which size would fit a stock 2003 2.2l S-10? Would it be the MSR-9200?

yea that should be the right ones...

[zerogravity58]

Quote: Originally Posted by jakethegriff

throwing up another question.

I have the Gm 7.5 10 bolt With the open 3:08 and want 3:42's or 3:73's. I know I cant just buy a carrier and have someone install it, what else do i need?

a 3 series carrier, gears, bearings for the carrier and pinion, shims for both, gear oil, diff cover gasket, new crush sleeve.

[MikDee]

Anyone know if a 89' Suburban rearend will fit my 96' Sonoma V6 2WD? It's a 3:42 Posi

[zerogravity58]

Its going to be to wide. You would have to narrow it and change the spring perches on it.

[cdog24]

There's a junkyard around here with a bunch of S10 rear ends laying around. I'm trying to find what gear ratio they are. I know there are casting numbers. But where? Most of the rear ends are covered in grease and dirt, so I'm not gonna spend all day cleaning off a whole rear end to find the numbers. So does anyone know where they are? I found some, just not sure if they are the right ones.

Also, do anyone know where there is a complete list of casting numbers that reference to ratios?

[zerogravity58]

Look in the glove box and it will have one of these numbers.
GU4=3.08
GU5=3.23
GU6=3.42
GT4=3.73
GT5=4.10
HC4=4.56

G80 - locking differential

If it has say the GT5 and G80 code in the glovebox then it would have the 4.10's and a locker. If it is a stock open rear then it will just have the gear code.

[cdog24]

Thanks for the reply. I saw that one in an earlier post

But like I said, rear ends laying around in junkyards dont have glove boxes attached to them. They are seriously LAYING AROUND - not in trucks.

[MikDee]

Quote: Originally Posted by cdog24

Thanks for the reply. I saw that one in an earlier post

But like I said, rear ends laying around in junkyards dont have glove boxes attached to them. They are seriously LAYING AROUND - not in trucks.

Good question, sometimes there's a tag on them with the necessary info., otherwise I don't know You could probably mark the wheel hub with a lumber crayon, then turn the yoke however many turns it needs to move the wheel hub one turn.
Example 3 1/2 turns of the yoke = approx. 3:42 gears,
next 3 3/4 turns = 3:73 gears,
next 4+ turns = 4:10 gears
But, I'm not sure how to check for posi?

[bww3588]

Quote: Originally Posted by MikDee

Good question, sometimes there's a tag on them with the necessary info., otherwise I don't know You could probably mark the wheel hub with a lumber crayon, then turn the yoke however many turns it needs to move the wheel hub one turn.
Example 3 1/2 turns of the yoke = approx. 3:42 gears,
next 3 3/4 turns = 3:73 gears,
next 4+ turns = 4:10 gears
But, I'm not sure how to check for posi?

if its a one wheel wonder, both wheels will spin opposite directions. if its a posi, they should spin the same direction.

[ZR2 B-LAZE]

what is a solid locker for the gm 10 bolt 8.5" rear axle thats reasonably cheap around 400$-600$

[zerogravity58]

I think detriot lockers has a unit for the 8.5 10 bolt. They are nice but they click when you turn.

[lowxpectationz20]

so this is going to be a dumb question, but is the 7.5 and the 7.625 the same rear end ? I know the numbers are different but say for instance i geta posi for a 7.5 will it work in my stock s10 rear?

[zerogravity58]

Yea they are the same rearend...only thing that will change is the axle spline counts. pre 88 the rears had 26 spline axles, after 88 they had 28 spline axles. Looks like you have a 92 so you have 28 spline axles. you can get a posi outta any 7.5, either an S10s, camaro, trans am, they are all the same.

[lowxpectationz20]

thanks man!

[low_s10]

Ok

So i own a 2000 gmc jimmy 4x4 4.3 auto is the rear end going to be a 7.5 0r 8.5 ?

[1993S10V8]

A couple of quick questions. I have a 1993 s10 2.5 auto, pretty sure mine is the 10 bolt 7.625 rear end w/3.73 according to glove box. Do all 1993 s10 have the 7.625 or do some have the 7.5. I read from wikipedia.com that all 1993's have the 7.625 rear end. Also do any of the first gen blazers have the 8.5 rear end that will bolt up to my s10 or is it only 1994 and up s10 pickups with the 5speed and 4.3? Planning on putting a v8 in soon and dont want to chance it.

[zerogravity58]

Low_s10 you will have to check yours because i know alot of blazer come with the 8.5 so its hard to say. You can tell by looking at the covers. The 7.5 is more of a square cover while the 8.5 is almost perfectly round. 1993s10v8 your is a 7.5/7.625 for sure. the 7.5/7.625 are the same rears and all the parts are interchangable. no first gens came with the 8.5 but the all the rearends are interchangable. A 2000 8.5 out of a s10 or blazer will bolt into your 93. I dont think the 8.5's started coming out until 96 and later in the s10's and blazers.

[1993S10V8]

Quote: Originally Posted by zerogravity58

Low_s10 you will have to check yours because i know alot of blazer come with the 8.5 so its hard to say. You can tell by looking at the covers. The 7.5 is more of a square cover while the 8.5 is almost perfectly round. 1993s10v8 your is a 7.5/7.625 for sure. the 7.5/7.625 are the same rears and all the parts are interchangable. no first gens came with the 8.5 but the all the rearends are interchangable. A 2000 8.5 out of a s10 or blazer will bolt into your 93. I dont think the 8.5's started coming out until 96 and later in the s10's and blazers.

Thanks for your help I will be looking for a 8.5 soon.

[wardog_admiral]

Quote: Originally Posted by zerogravity58

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.

ok ok so i have a 1990 s15 ext cab what posi rear end can i use by that i mean can i take one from some other vehicle and bolt it in?

[zerogravity58]

you can take from from any other vehicle with a 7.5 10 bolt with 28 spline axles....so that would include S10s, camaros, trans ams,

[NYCBLAZER]

GU6 IS A 3.42 REAR BUT WHAT IS G75
THIS REAR AND PARTS IDENTIFICATION CAME FROM A 2001 4.3L 5 speed xtreme blazer
what do i have here? do i have a posi, or a limited slip?
and would it hold the power of a 6.2L with a t56 or should i go with a ford 9 inch

[zerogravity58]

confusing but what i found G75 to be is G75 AXLE,RR 3.62 RATIO....I dunno

[NYCBLAZER]

hmmmm got me there I don't know either

[lil_khris_pit81]

How Can I tell wat size my axle is? I have an 92 2.8l 3.42. Because i'm bout to buy a posi but want to make sure im getting the write one. I know its a 10 bolt but i dont know if its 7.5 or 7.625. 26 or 28.

[zerogravity58]

It will be 28 spline axles. It doesnt matter if its a 7.5 or 7.625 carrier then are all interchangable...

[dkracr387]

okay, this might be a silly question but if you can answer i would be delighted. i have a 91 s-10 that i slide. everyday driver... i live in a small town and i slide a lot. right now its open dif and i shift lock every turn i come to in order to break traction. i want posi bad....but im on a budget. is there a spool i can use? i checked summit and jegs and can't find one to fit the 7.5/8 28spline 10-bolt i should have. i was considering welding it if i can't get a locker.... what risks do i take doing that? my motor is all stock just exhaust and flipped intake lid any suggestions?

i looked into doing the torsen-zexel late 90's carrier swap, but that looks expensive and hard. so, weld or do any of you know where i can find a spool? thanks!

[zerogravity58]

they do make mini spools for them and you can get them for about $150. By doing this tho your going to eat through tires and its going to be a b!tch in the rain when turning.

[rxforspeed]

Great info guys! I feel much smarter and informed about the axles in our trucks after reading that entire thread for the last hour or so. I've got a question that I didn't see completely answered there though. I've got an '89 2.5l 5-speed, hopefully it's a 28-spline axle. If not, I'll get used 2WD 28-spline axles from the salvage yard to go along with the new limited slip I'll get. I don't want to use a "c-clip eliminator" kit because I feel that it would be a waste of money with rear discs (the calipers hold the axles in should a c-clip pop out), but I don't know what discs to use. There are a few blazers at my local salvage yard with rear discs, but I haven't checked them close enough to know if they're 7.625 or 8.5". There are also a few 3rd and 4th gen F-bodies there. What backing plates, calipers, and rotors will directly bolt on to a 7.5 or 7.625" axle housing, and what do I need to know or look for when I'm searching the salvage yard? I'll also need a non-ABS master cylinder and porportioning valve to work with the discs-what can I pull them from? And while we're discussing other brake components, I'm going to eventually need a smaller diameter brake booster to clear my tires when I'm layed out-any suggestions on that? Thanks for all your time, help, and info guys-I really appreciate it!

-Adam Collins

[dkracr387]

okay, if you know somewhere i can find a mini spool ill more than glady buy one for 150 bucks that way i can take it back out in the winter. northern ohio winters wont be much fun locked up posi. and i plan on killing tires sliding anyways so that's no big deal to me. what do you think my odds of breaking a welded rear end are though putting that much side pressure on it? think the weld would break because people keep telling me its really dangerous to weld and i should do a mini spool instead that its safer....any suggestions would be nice, thanks

[The Griff]

what if i want discs in the rear? is there an axle i could get at a junkyard like out of a camaro or something? for my 91 2wd blazer 10 bolt

[Pop Chevy]

I need some help. I just bought a beat up 1999 Xtreme w 2.2 and 5 spd. Trying to track down a bad high speed vibration and found the spider gears and side gears look like metal eating mice had gotten to them ! BUT, I can't seem to find replacements. Found one set were 26 spline and they didn't fit, got another set from a 95 Blazer 28 spline they don't fit either. The side gears are different the spiders actually look heavier. It's 7 5/8 open rear. What do I need here, I need to get this thing back on the road ASAP.
Thanks, Pops

[zerogravity58]

your best bet would be to pull a open carrier out of another blazer with a 7.5. Just put your ring gear on it and reset the lash and you would be good to go. It should only take a few hours. To the other post the axles on the disk brake rear and drum rears are the same. Just the backing plates are diffrent. You can pull rear disk off of a camaro and they should bolt right up with few problems. they did for me anyways. Instead of buying a spool also you can get a good use limited slip for $150 then you dont have to worry about changing.

[King_Ice_Flash2]

Wasn't there someone who makes a harder center pin?

[zerogravity58]

they do but i cant remember who

[vanallen87]

7.5 can absolutely take a pretty good beating. Agreed that the gears and posi unit must be top quality but certainly is worth the money rather than upgrading to 8.5 or the big two.

[zerogravity58]

Quote: Originally Posted by vanallen87

7.5 can absolutely take a pretty good beating. Agreed that the gears and posi unit must be top quality but certainly is worth the money rather than upgrading to 8.5 or the big two.

Depending on what your going to do. If its a street/show truck or daily driver the 7.5 can hold pretty well. Dragracing or anything above the high 300's to 400HP even on street tires is pushing your luck with them. They werent made to race or have alot of power thrown at them.

[Pop Chevy]

Zerogravity, That was good advice ! I swapped out the carrier and changed the bearings in the process. With all the chips floating around the brgs were SHOT ! Did the pinon brgs and axles too. I must be old and slow, cause it took all day. I used a 95 carrier that was in great shape. Runs smooth now.
Now I have to deal with the trans that is still jumping out of 5th ! I'm driving it anyway.
Thanks, Pops

[77vega]

Can someone tell me how to get the C clips off the end of a 7.5/7.6 S-10 rear end axle? I took off the rear pan, took out the pin that holds the spider gears, mine is limited slip, pushed the end of axle toward the center of rear, and that`s as far as I got. C clips are right there but don`t seem to want to fall out. Do I try to knock the clip out with hammer and punch or try to pull them out with vice grips? Someone must know on here.

[zerogravity58]

try spinning the axles alittle...if they dont fall out then try tapping on them with something. They should fall right of if you hit them with the end of a screwdriver.

[77vega]

I tried spinning the axles, pulling them in and out, holding one end of clip with screw driver and hitting the other end with a screw driver and hammer and still wouldn`t come out. Tried needle nosed plyers but won`t come out. After looking at it for half an hour, came to the conclusion that the last guy must have squeezed the ends of clips together somehow. So I burnt them in half and they came out in 2 pieces. Now got to clean up the little bit of slag and dirt. It is a 342 G80 7.6. Will the ring and pinion fit in place of a 7.5 open ring and pinion? That is my plan if the axle splines are the same.

[davet1960]

mine equiped with 4:10 gears and a Detroit locker came apart just yesterday, without slicks, 4.3, 5 sp, BW, small cam, moderate head work, 480 CFM TBI Holley.

[davet1960]

remove spider gears, required 1/4" box end wrench, slide pin out, rotate pinion, catch spiders as thet drop, push axles in toward ring gear, remove c clips, remove axles, remove carrier bolts, remove carrier, remove pinion nut, drive pinion in towards casing, watch toes, pinion is heavy.

[krly79]

All this and no length dimensions for the different 7.5/7.6/8.5's? I'm disappointed.

[s106banger]

i just purchased an auburn posi off ebay to go with a set of 4.10 gears. its out of a 94 z28 that had 119k miles on it. i have heard mixed reviews of the auburns. do they last long? my truck will be a street/strip truck and ill hopefully be pushing close to 300hp by next spring and maybe be running drag radials. think things will hold up pretty good?

[SLStruckin]

Quote: Originally Posted by s106banger

i just purchased an auburn posi off ebay to go with a set of 4.10 gears. its out of a 94 z28 that had 119k miles on it. i have heard mixed reviews of the auburns. do they last long? my truck will be a street/strip truck and ill hopefully be pushing close to 300hp by next spring and maybe be running drag radials. think things will hold up pretty good?

I run an Auburn Pro in my 98 noma, 7.5", w/ 3.08's, the unit itself has held up great over the few years I've had it. I've put about 70k miles on mine, and the characteristics are pretty good. You definitely won't one wheel peel if thats what your thinking.

If you treat it decently you shouldn't have issues, but just like most things, if you abuse it, it wont take it in the long run.

However, make sure that the auburn is either PN# 542046 or 542040, because if its 542047 or 542041 it wont work. Difference being the first two are series 3 cases, the second two are series 2 cases. Your truck currently uses a series 2 case w/ 3.08 gears. Though im no expert on Z28's, Im pretty sure that most of'em in 1994 came with 3.42's which would be the right unit for you. Always good to double check though.

Mine is PN# 542047