I recently bought a parts car with a 10 bolt posi 3:23 drum rear end in it (REALLY FIRM!! AND THE RING AND PINION ARE MINT). I took it out of course . in my good Trans Am I have a 3:27 9 bolt disk posi and it would be nice to have a spare that is the same that I have in the car already then this way I will not have to change speedo gears etc. if anyone has a 9 bolt posi with 3:27 gears and are looking for a 10 bolt posi with 3:23 gears and would do a trade email me. I would trade with anyone outside of Minnesota as long as the other person pays all shipping charges in short Minnesota trades only please. I am not willing to trade for a rear end that is bad or needs work as mine needs nothing except to be put into a car, oh mine does need oil since I opened it up to double check the gear ratio.I would have to be able to open up the prospective rear end so I could double check the gear ratio and inspect the gears. southpaw1969@hotmail.com