10 bolt faq
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to start the covers look diffrent. a 8.5 cover is completly round almost a perfect circle. A 7.5 cover isnt the same and has more of a square look. If my memory serves me right i dont think many, if any s10's came with 8.5's until 98ish. My 94 4.3 5 speed has a 7.5
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i have a 2003 s10 4.3l auto. i was wondering if i got a 10 bolt eaton posi 28 spine. if it would work since i have a one spin wonder rear end lol? if it will can u tell me what else i need to get it to work just fine i dont plan on putting alot of hp to it just maybe 400 to 500. any comments would b great
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If you have the 7.5 (7.62) rear end then 400 to 500 HP will likely break it. If you have the 8.5 rear end then it will be 30 spline and will handle that amount of power.
If you have the 7.5 and a 3.23 to 4.10 gear then the Eaton will work. If you have a 3.08 to 2.41 gear then the Eaton will not work because the Eaton is only available in a 3 series. You will need bearings ahd shims to install it. http://www.nastyz28.com/forum/showthread.php?t=19773&highlight=install+posi
If you have the 7.5 and a 3.23 to 4.10 gear then the Eaton will work. If you have a 3.08 to 2.41 gear then the Eaton will not work because the Eaton is only available in a 3 series. You will need bearings ahd shims to install it. http://www.nastyz28.com/forum/showthread.php?t=19773&highlight=install+posi
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Wow, this thread delivers! Thanks to everyone who has contributed. I've been repairing gearboxes in machinery for years and finally decided to break down and do my rear, and I realised I know nothing about them (until I read this thread).
I always knew I had an 8.5" rear (OEM in my '93 2WD 4.3), but never knew what gears I had. Now I know it's a 3.08. All I have to do now is save up a little bit of $$ and jump in.
I always knew I had an 8.5" rear (OEM in my '93 2WD 4.3), but never knew what gears I had. Now I know it's a 3.08. All I have to do now is save up a little bit of $$ and jump in.
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If you switch the rear to a 8.5 with 3.73's then you will have to change the front gears to 3.73's also. You would be better off though changing the gears in the 8.5 to 4.10's. The bigger the tire you run is like running a smaller gear.
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You may want to check again. I dont know of any older s10's or blazers coming with the 8.5's until 98-99ish. Most of the ones that did come with the 8.5's were ZR2's or 5 speed trucks.
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I got the book and dvd for christmas and the info and instructions are pretty good so anyone could follow them. I would recommend it, lots of good info and covers more than 1 type of rear. The one thing it didn't cover was the gm 10 bolt 7.5 with the gm gov lock. It did have the 12 bolt with the posi though so I think I can figure it out, I'll just watch a couple more times to make sure.
On a side note, I had a 91 Sonoma Reg cab, long box that I just sold had the 4.3 and the 5 speed and it had the 8.5 rear in it.
On a side note, I had a 91 Sonoma Reg cab, long box that I just sold had the 4.3 and the 5 speed and it had the 8.5 rear in it.
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You have to use this to disassemble the Governor Lock. Cost about $130 around 10 years ago.
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1,395 Posts
Yea, the parts for the Gov Lock are pretty expensive. The last governor that I bought was $75, and that was several years ago. If this is a street truck then the Eaton Posi or Torsen will work great. If it's for off road then look into a locker of some kind.
My -92 s10 has GQ1 and GT4.
Saved this Auburn from dumpster.
Can someone confirm is it 2 on 3 serie? Hoping it will work with 3,73.
http://img141.imageshack.us/slideshow/webplayer.php?id=dsc00670x.jpg
Not guite as good as new, but i guess it can survive behind the IRON DUKE.
Saved this Auburn from dumpster.
Can someone confirm is it 2 on 3 serie? Hoping it will work with 3,73.
http://img141.imageshack.us/slideshow/webplayer.php?id=dsc00670x.jpg
Not guite as good as new, but i guess it can survive behind the IRON DUKE.
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161 Posts
ok guys i read this entire thread and im still wondering what rear end i got. i know i have 3.08 ratio (GU4) but i am still wondering if it is a 7 5/8 or a 8 1/2.... My dad teaches automotives at NAIT and he is trying to convince me that its the 7 5/8. My truck is a 2003 S10 Extreme 4.3 5 speed manual w/overdrive. it has drum brakes in the back btw. Any info into what you guys think it has would be great cuz i am in the process of deciding what is all needed to drop a 350 i got in. Thanks!
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