4th gen gear swap

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Jul 24, 2011 | 07:56 PM

dewfamily

Thread Starter

Junior Member

Joined: Apr 2010

Posts: 54

Likes: 1

From: Clarendon, NC

Car: 1991 RS camaro

Engine: 5.7

Transmission: 700r4

Axle/Gears: peg leg for now

4th gen gear swap

I got a 1991 RS with a peg leg. I have been trying to find a posi with at least 3:42 gears. As alot of you know it is getting harder to find. I have ran across a couple of deals though. One is from a 1989 Iroc, but I am thinking that even though it is a posi it probably is 2:77. The other though is from a 1994. I have read the thread about it being a couple of inches longer. So my question is, can I swap in the unit and gears into my housing? If so, will the bearings and all be usable? Any help would be greatly appreciated. thanks

Jul 25, 2011 | 04:46 PM

windowrattler

Member

iTrader: (3)

Joined: May 2002

Posts: 144

Likes: 0

From: Wisconsin

Car: 92 RS, 89 Formula, 84 Iroc

Engine: Carb 350, TPI 305, TBD

Transmission: T-5, 700r4, TBD

Axle/Gears: 3.42 Posi, 3.08 Posi, Moser 3.73

Re: 4th gen gear swap

All the internals are the same from 90-02. Differentials from 82-89ish won't work because they are 26 spline axles.

Jul 26, 2011 | 01:09 AM

abray1

Supreme Member

Joined: May 2005

Posts: 1,058

Likes: 4

From: Malvern, Arkansas

Car: 90 IROC 2-92 Zs blk vert & prpl

Engine: stealth ram brodix track 1 ful port

Transmission: 700r4 4l80e

Axle/Gears: iroc 375 lokr 92 Z 277 pos vert 327

Re: 4th gen gear swap

The 9 bolt will live longer and is a better design. 7 3/4 VS 7 1/2. There are still gears and posi units out there. I don't know why everyone doesn't use them. I had 500 HP and almost 600 torque on mine with 2.77 gears and could not tear it up and it had over 120.000 miles on it.