Ok, I looked thru the first 20 pages of the topics her and couldn't find what I felt I needed to solve my problem. My truck is an 04, extended cab, 233,000 miles on drivetrain, rear disc brake truck. When I brake, the rear end feel like it loads up and unloads (for lack of better terms) when I release the brakes. I replaced u-joints not quite a year ago, along with brakes and everything looked good. I filled the drive shaft with grease before slipping back onto transmission end, couldn't believe there was no grease zert in that slip yoke to do that. Seems like it just started this this summer, but I don't know where to look. Could the shocks be letting the axle wrap just a little bit when braking? The truck is fairly clean underneath for the miles and environment. Its just annoying I can't figure this out. Thanks for any help.