S10 8.5...
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From: Pensacola, FL
S10 8.5... I've heard our 7.5 fits perfectly in an S10...if this is true the ZR2 8.5 differential should fit f-body's as well...has anyone thought this before?
Is this 8.5 strong enough?
Is this 8.5 strong enough?
Staging Lane
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From: Oswego, IL (~40 miles west of Chicago)
I used to be an S-10 guy i had a 4.3 5 spd with an 8.5", i only had full exhaust and a few other things done though. A guy i knew had the same thing but put mildly built LT4 under the hood with a t-56. The 8.5" lasted like 4 or 5 months i think before it was gone with stock gears(3.08). Keep in mind there is no weight in the back and the tires would spin pretty freely. He had Z06 wheels on it. He is now putting a 9" in with a 4 link.
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s10 8.5" rear end is too narrow and no torque arm mount, better go 12 bolt or 9". Strength is comparable to a 12 bolt the 8.5" replaced the 12 bolt as H/D rear end and GM quit making 12 bolts because of this 
Yeah I was shocked as **** to find an 8.5 under my Blazer ('03 5 speed). Though for sure they all had the 7.5/7.625 rears. Briefly entertained the thought of swapping rears, but no way my fabrication skills are good enough to make that work.
I have the 8.5 in my monte carlo. it is a street car with 4.56 gear. it has stock axles and a posi unit in it had it for about three years and my car run 6.30's 1/8 mile n/a and never had the first problem with anything breaking or giving up.
