[markjohnson]

That was a common problem on Camaro/Nova leaf spring perches. I see you have U-bolts instead of the T-bolts. That normally takes care of spring perches breaking away from the tube but obviously not in this case. The best known solution is to keep the U-bolts and weld small gussets from the front and rear of the perch up to the axle tubes. That, or stop with the power shifting and we all know how difficult that habit is to break! By the way, axle tubes retain plenty of gear lube. That's why 12 bolt differental covers have that ridge on the back side, so lubricant flows down from it to make it's way down the axle tube to the outer rear wheel bearings. Good luck.