I have a 64 Plymouth Fury I'm working on. It originally came with a trunion style 8 3/4 rear. The one with the bolt in the end of the axles. I want to switch to a new style 8 3/4 and was wondering if I can swap the guts of a new rear into the old housing. Will the parts fit or do I need to use the new style housing with new style internals? Thanks for the help. TD