I didn't replace any mounts, the body hits the cage if you slam something hard but it dosent bother me. If I hit something that hard without the cage I would be putting windows in and hammering the openings back out like I used to do every trip.
The axles are from a 75 bronco, chromoly's, gears, lockers, all that fun stuff. We have built a cupple of ranger based rigs the same way and they all do well for the kind of wheeling we like to do. My next mod will be building a dubler or buying an atlas for playing in the rocks...