Just got my truck back yesturday from the dealer. Took it in 2nd time for rear end whine. First time they rebuilt, now they pulled the cover, did a pattern ck and they said it was fine. I was NOT allowed in the shop area for liability reasons to inspect myself before they put the cover back on. They did put in the D/C required 75-90 and got rid of the 140 the tech put in at rebuild. SO far so good. Atleast it's documented if it clunks out. .