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swapping a 99 z28 rea end into a 99 SS

This is a discussion on swapping a 99 z28 rea end into a 99 SS within the Drivetrain forums, part of the LSx Technical Help Section category; So my rear end went out of my 1999 camaro SS. I already have a rear end out of a ...

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    swapping a 99 z28 rea end into a 99 SS

    So my rear end went out of my 1999 camaro SS. I already have a rear end out of a 1999 camaro z28 waiting. So my question is is there a difference in the two rear ends? Will it work? I was on the SLP Performance website last night and seen that one of the SS upgrades was a Zexel - Torsen Differential. Is this different than whats in the z28? Any info will be very helpful. Thanks for your time.

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    Senior Member Zboner's Avatar
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    to be honest there all about the same, they all have the same holding power.

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    Senior Member JaycenK's Avatar
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    There was a change but I can't rember what year it was. I want to say 2000 they went from auburn to the torsen. Open the rear cover and look at it. Auburn is a clutch style and the torsen is a worm gear style. look up pics at eaton and auburn and then you will know what your looking at. Are the gear ratios the same? some Auto Z's came with 2.73 and 3.23's and the 6 speed cars came with 3.42's I think.

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    ok guys i got up under my car and damn there is a big big hole ripped down my inspection cover!!! its about 2 inches wide and 4 inches long.

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    Senior Member JaycenK's Avatar
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    inspection cover for the rear I'm guessing?

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    yeah there is a big ripp down it. I still dont know if the z28 rear end will work. I dont know what to do. I guess I'll have to pay someone to work on it!

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    The Bandit Wesman's Avatar
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    The major thing you need to check is whether the rear is from a car with a 3 channel or 4 channel ABS system. They are not compatible with each other, if you car has a 3 channel then you need a 3 channel rear, same with the 4 channel.

    Is your car manual or automatic?? If both cars are manual, the gear ratios will both be 3.42. If either is automatic though, the gear ratios will be different, because the Z28 would come with 2.73's and the SS would come with 3.23's.

    As for the limited slip units, somewhere around '99-00 they switched from the Auburn cone-clutch style limited slip to the Zexel-Torsen units. I don't think one is necessarily better than the other; the Auburn seems to be stronger, but the Torsen doesn't wear out like the clutch type Auburn does.

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    wesman, both cars are manual.

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    The Bandit Wesman's Avatar
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    Quote Originally Posted by COKEBOTTLES View Post
    wesman, both cars are manual.
    Ok that makes it easy, they will both be 3.42 gears.

    Only thing you need to figure out now is if its 3 or 4 channel ABS system. If it has traction control (ASR), then it a 4 channel.

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