kirt70camaro

Can I replace the whole rearend say out of a Z06 with a 3.42 into a auto car. I have the 2.73 gears and is a pig out of the hole. I was quoted $1600 to change it to 3.90 gears. They said with my case that was my only option. It's cheaper just to switch the whole rearend.

Bluefire

Yes you can. I changed the whole carrier when I went from 2:73 to 3:42.

kirt70camaro

Did it change the car a lot? Is it faster off the line?

Rob Petyo

I went from a 2:73 to 3:42 to 3:73 - Much faster off of the line, with a best 60' of 1.36.

kirt70camaro

1.36 I think you may have changed more than just the gear...lol

Rob Petyo

video in sig

Bill Curlee

IF and When you change out your rearend gears, you will also have to have a tuner tune your PCM so you maintain the correct A4 Shift points.

While you have the differential off the vehicle, at a MINIMUM, change the output seals.

Here are a couple post for your reading enjoyment..


C5 Differential Seal replacement: http://forums.corvetteforum.com/c5-g...on-photos.html
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- C5, ragtopws6 , Upgrading your C5 rear with C6 Z06 guts, : http://forums.corvetteforum.com/c5-g...-z06-guts.html
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- C5, Its_Go_Time, Output Shaft Install - Left and Right: http://forums.corvetteforum.com/c5-t...post1573407966

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Patches

Also, in the A4 there is an adapter plate pressed into the front side of the differential that you need to transfer to the new differential housing. You can see the plate with its seal in the pic below.