I want to either upgrade or replace the rear in my 1973 Buick Regal. I believe it has the 8.5 10 bolt with the bolt-in axles (granny gears and an open diff). I have added gears and a posi into a chevy 8.5 before...so I am not against doing this myself. Anyone have a link to the correct bearing kit? Also, any preference on gear manufacturer and posi? I am thinking 3.42 gears (or possibly 3.23's). The alternative is to find someone that sells a drop in replacement that is set up the way I want it. I kind of doubt there is anyone out there...but I figured I would ask!