8.5 rebuild question

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bertscova

Greasemonkey
Jun 27, 2015
101
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Im rebuilding a 86 olds 442 373 lsd. The ring and pinion look to be in excellent condition. How much power can the factory gear set hold up to. Whats in car 450+ hp 383 stroker th350 2800 stall. Mickey Thompson street ets. Wont see the track often. When there will be footbrake off line. Just wondering if i need a better gear set
 

Bonnewagon

Rocket Powered Basset Hound
Supporting Member
Sep 18, 2009
10,540
14,217
113
Queens, NY
My buddy has a 3:73 posi 8.5 rear in his '77 TA. It has lived behind a very strong worked Pontiac 400/T-350 for many years. Even with his Italian temper. His complaint is he can't go on the highway with the 3:73's.
 

Michael Watts

Master Mechanic
Dec 12, 2017
418
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I have a 1979 Z-28 Rs with a 500 Hp supercharged 377 small block Chevy. I just upgraded it with a Moroso "Brute Strength" posi ,Chevrolet 3:42 gears .Mosier 30 spline axles. With no issues.An 8.5 10 bolt is just as strong as a 12 bolt when built with the right parts.
 

spidereyes455

G-Body Guru
Mar 6, 2013
776
1,614
93
Northeastern PA
Lots of turbo Buick guys running 11's and even into the 10's with not much more than aftermarket axleshafts.
 

bob64

G-Body Guru
Mar 30, 2017
713
674
93
Niagara Falls, Canada
Worry about torque more than Horse power, torque will bust stuff up.

I got a Camaro, the engine in it now started as a stroked 496 with 602hp/513tq with a 8.5 an 3.73 gears an then l added nitrous an better heads++, an it's still holding! Transmission is build (4L80E) full Manual an it bangs between gears if you let it, so l think your good to go!!!!
 
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