I have a 60 Impala rearend under my 37. I think it is 54 1/2 which is within a half inch of a 64-72 Chevelle/Nova/Camaro. I would stay away from S-10 rear ends as they have a 7.5 ring gear which is very weak. Opt for a 8.5 inch ring gear from a 71 up GM. I realize car rears are 5 lug but it shouldn't be a big deal to redrill the axles or use adapters. Car rears just tend to be narrower. Later
Dave
