When going spring over axle and you went beyond the 6" rule on lifts. When the rear spring perches are welded on the axle is generaly kicked up no more then 20 degrees to help take care of the u joints binding. This condition only gets worse when you wheel it.
Even after the repositioning of the rear axle there may be a need to relief cut the u joints so they not bind under extreme wheeling. You may have to relieve the front u joints as well.
Depending on which springs you used there will also be spring wrap in the back and you may have to address this as well.
