68 GTO Rear End Swap with 76 Cutlass - Pontiac GTO Forum
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post #1 of 3 (permalink) Old 08-27-2018, 09:44 AM Thread Starter
 
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68 GTO Rear End Swap with 76 Cutlass

I have a 68 GTO with 3.08 Non-Posi, 8.2". In my search for a better rear end i came across a 76 Cutlass Rear end with 3:73 posi. Will this bolt in?
The GTO has a TH400 Transmission, please give thoughts on using this rear end.
Had same gears and posi in a '67 Cutlass, 330ci, and loved it.
Thanks
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post #2 of 3 (permalink) Old 08-27-2018, 10:59 AM
 
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Originally Posted by John Schutt View Post
I have a 68 GTO with 3.08 Non-Posi, 8.2". In my search for a better rear end i came across a 76 Cutlass Rear end with 3:73 posi. Will this bolt in?
The GTO has a TH400 Transmission, please give thoughts on using this rear end.
Had same gears and posi in a '67 Cutlass, 330ci, and loved it.
Thanks
Hi John, I assume the th400 is a "PX" code. If your axel code is a "WE"code it is factory, a "YE" code would be with locking diff. It depends on what your trying to achieve. Are you looking for street or highway driving. If you have air conditioning that can be a factor. I am going by factory availability. you could go with a 3.36 or a 3.55 in the same carrier and even upgrade to a safety track rear end. Good luck with your decision hopefully some more knowledgeable members will wade in. The more info you give the better answers you get.
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post #3 of 3 (permalink) Old 08-28-2018, 09:34 AM Thread Starter
 
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No AC on my GTO,this will be a daily driver, some highway, i haven't had the engine apart yet but guessing its pretty much stock, I won't be overpowering the rear end.
Will a 76 cutlass rear end bolt in to a 68 GTO?
Thanks
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  Pontiac GTO Forum > The 1964-1974 Pontiac Tempest, Lemans & GTO > 1964-1974 Tempest, Lemans & GTO Undercarriage, Frame, Transmission and Differential Discussions.

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