2.73 to 3.73 rear end. What to do

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Feb 21, 2008 | 10:26 PM

firebird896

Thread Starter

Senior Member

Joined: Sep 2007

Posts: 617

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From: Chicagoland Area

Car: '89 GTA/'86 TA/98 TA

Engine: 350/350/LS1

Transmission: R4/T5/4L60E

Axle/Gears: 3.23/2.77/3.73

2.73 to 3.73 rear end. What to do

Ok I have a 1986 Trans Am and I think I have a 2.73 in the rear. The Rpo code said it is a limited slip so one day I just nailed it and got a video of me doing so. While watching it i noticed that the right tire was only spinning. So my question is will the 3.73 make both wheels spin?

If this is true what should I do to upgrade it. Should I get new gears for it or buy a new rear end all together. Please help and thanks in advanced

Oh and just if your thinking thats me doing a burnout in my sig. Its not, it is just a neat pic I found and it looked like my car so I claimed it as mine!

Feb 22, 2008 | 01:47 AM

mcgarnicle

Senior Member

iTrader: (14)

Joined: Oct 2006

Posts: 823

Likes: 1

From: erlangen, Germany

Car: 1991 Z28 1LE

Engine: LS1

Transmission: T56

Axle/Gears: 3.42

Re: 2.73 to 3.73 rear end. What to do

There is a lot of info on this, this question comes up a couple times a week. Basically you'll need a 3 series posi carrier to work with the 3.73's. And it will be cheaper to find a whole rear end with what you want already in it.