Im building a 1971 chevelle wagon im looking for a 12 bolt posi rear end that comes stock on another car that is inner change able and relativle easy to find can a newer model 12 bolt inner change on this car and if there is one with disc brakes preferabley if anyone can help out it would be greatly aprreciated and does any car come stock with 4.11 gears that i can swap into the rear end?