4th gen rear end What do I need to look 4

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Aug 25, 2005 | 03:43 PM

CamaroSpeed

Thread Starter

Junior Member

Joined: Aug 2005

Posts: 65

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From: Texas

Car: 1987 IROC

Engine: 305 Tpi

Transmission: 700r4 With B&M Rebuild Kit & 2800 S

3rd gen to 4th gen rear end What do I need to look 4

I want to put a 4th gen rear end in my 3rd gen with disc brake's posi trac. When I go to the wreaker what do I look for. What year,model,vin ect. If someone can help me out please.

Last edited by CamaroSpeed; Aug 25, 2005 at 05:28 PM.

Aug 26, 2005 | 10:38 AM

TKOPerformance

Supreme Member

Joined: Dec 2003

Posts: 2,391

Likes: 1

From: Newark, DE

Car: '86 Camaro, '02 WRX, '87 K5, '67

Engine: 350 TPI, 2.0turbo, 383 in the works, 289-4BBL, 232, A-head 4-cylinder

Transmission: T56, 5-speed, 700R4, C4, T176, semi-auto 2-speed

Axle/Gears: 3.73, 3.90, 4.88, 3.55, 3.54, 7.00

With 4th gens it really doesn't matter. All the rears a 7.625" 10-bolts with 28-spline axels. Your best bet is to pull the cover and determine the gear ratio and whether or not it has a posi. This is the only way to really be sure what gears it has and if it has a posi. The option codes tell you what the car had from the factory, but someone may have swapped the gears for a better set, installed a posi in what was once an open rear, or broken the original rear and just swapped in a peg leg rear with a different gear ratio to get the car back on the road. Taking a peak is the only way to be sure.