When im runnin 105+ or so my rear end makes a small rattle that shakes the hole truck. No shaving in the diff. Nothin abnormal. I did have 4.10's installed and the people that did it said the rear end was in Perfect shape. But at high high speeds its just a constant rattle almost the ring is rubbin somethin but its not. Anybody know what this might be?

 

Did they install a new pinion bearing? Have you ever replaced your u-joints? Your exhaust isn't rubbing the frame/ crossmember anywhere is it?

 

check the u-joint. what lube are you running? and is this shop repitable?

 

The shop is repitable. All they do is circle track cars and Trucks. I think they did install new pinion bearing. Never replaced U-joints.