found a junked GTA at the autowreckers with rear disc brakes. Where can i find info on what rearends were put on the GTAs? were all of them posi? what thinks should i look for to find out if it's a posi, has the 3.27 gear?

thanks

 

Look at the rear cover. If it has 9 bolts the it's a Borg Warner diff and there's a very good chance it's 3.27 gear and a posi if it's an auto or 3.42 gear if it's manual.

If there's 10 bolts then you'll have to pull the cover and look inside.

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87 IROC-Z SuperPro ET Bracket Race Car
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What year is it from? It could be 2.77, 3.27, 3.23, 3.42, or 3.45. And yes, it will be posi.

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