Is it ok to put a ring and pinion that have already been used and broken in into a different axle? I've heard that the ring and pinion have a way of matching themselves to a housing and once they've been run in that housing you can't use them anywhere else. Or is it that once they've been run together as a unit they can't be seperated? I can't remember. Also, can a ring and pinion that has been run in the rear axle be run in the front, or vice verse (if they're both 10 bolts of course)?