Alright, I don't have one yet, but eventually I want a Nova or Chevelle... my question is... can you put rear truck axles under a 2wd truck or car? Or is there a difference between the 2? It's just more common to see 4x4 12 bolts, than 2wd ones. Also, besides the ford 9" and a GM 12 bolt, what are other common axles to put in muscle cars, or cars with big TQ and HP numbers? Thanks!