I have resolved my issue of rear popping noise.i my problem was at low speed and small bumps worse when backing up and turning. Passed me off for a long time .if I shook the truck side to side it would pop as if the the drive axles had play and made a hell of a racket. All I did was jack up the rear hammered a pry bar between the leaf spring at the front of the leaf Pakistan near the stock clip and cut a piece of UHMW sheet about 2x3 inches and slid it in between the the existing pad and the upper leaf ,,,,it's like I'm driving a new truck. So happy.