After a PM from Desertrunner, I tightened the u-bolts on my rear springs. They were loose! The dealer evidently did not tighten correctly when they installed my last diff. I tightened by hand wrench only. I need to check torque and maybe tighten a little more. I drove my truck after and the difference is night and day. I might have felt a small clunk or could have just been brake noise. What a difference. If you are having axle wrap clunking, check your u-bolts. Thanks DesertRunner. This is what TitanTalk is all about.