I have two Yjs and I am using parts from one to build the other either directly or by parting out the parts yj. In the yj to be parted out I have an air locker in the front. I wanted stronger diffs and axles so should I keep it or should I sell them and get a better differential for the front. I was thinking of putting in ox lockers front and back? Or would it be best to keep the air system, current stock differentials and upgrade the axle shafts?