The bearing is pressed on the axle and held on with a collar. New bearings are cheap and come with a new collar. It cost me about $30 to get one pressed off and on. I would say swap the whole axle out of the parts rear if there the same bolt pattern, but don't think they would be.
So the bearing is press on the axle, I may not can use the one out of my parts rear end wear bp not same, but may can use one if its good out of a very rusty 71 /6 Dart I have!
