I recently pu ta zz4 crate motor in my 87 trans am and still have the stock 2:73 10 bolt. I'm looking to change the rear preferably 3:42, 3:55 rear gears and while I would prefer a ford 9 inch or 12 bolt i'm open to a 10 bolt with those gears or maybe even a 4th gen rear. If anyone has anything private message me, respond to the thread or email me at jordanyoung86@gmail.com