2.73 to 3.42 rear axle swap

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Apr 16, 2010 | 08:15 PM

Shadyredeyes

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Joined: Mar 2009

Posts: 260

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From: Texas

Car: 1987 Camaro Iroc Z28

Engine: 350 S/B

Transmission: 700 R4

Axle/Gears: 2.43 Gear Ratio

2.73 to 3.42 rear axle swap

I just bought a 3.42 complete rear to replace my 2.73 with. It came from a '97 Z28 with disc brakes. Comes with everything but proportional valves. My question is this, will this rear end simply bolt up to my exsisting setup or will I need to replace mounting brackets, driveshaft, master cylinder, or anything else? First time I've tackled an axle swap so I need to know what to get to do this job. Can't afford to have her just sitting there waiting on parts.

Apr 16, 2010 | 08:41 PM

JamesC

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Joined: Aug 1999

Posts: 19,282

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From: Lawrence, KS

Car: Met. Silver 85 IROC/Sold

Engine: 350 HO Deluxe (350ci/330hp)

Transmission: T-5 (Non-WC)

Axle/Gears: Limited Slip 3.23's

Re: 2.73 to 3.42 rear axle swap

Quote:

Originally Posted by Shadyredeyes

The rear is a straight bolt-in. The master and drive shaft are fine. Swap the combination valve for the first-design 1LE valve. You'll need the first-design parking brake cables and a change in speedo gears if you wish the speedo to read correctly. More info toward the bottom of the link below:

https://www.thirdgen.org/forums/tran...-10-bolts.html

JamesC

Last edited by JamesC; Apr 16, 2010 at 08:46 PM.