Quadrasteer vibration

Has anyone ever used the wrong lube in a Quadrasteer rear end? I have one that chatters when turning. Lube was replaced twice in the last few months, once by me (things worked fine then) and once a dealer replaced it by mistake. Now the vibration and chatter in turns is bad. I removed the cover and could see nothing wrong. This is the Quadrasteer that was under water for a few days. The book says that the Quadrasteer use's a special oil (29 dollars a quart) That's the lube I used and everything was fine. Then the dealer changed it. Any ideas?

$29 sounds like the right price for the lube. I Do not have a Quadrasteer rear end but I changed my at about 90k. It was starting to get a bit loud in the corners when the tiers slipped. New lube got it done. Do you have a good title to your truck?

take it back to dealer and bitch intill they fix it

My 2001 is a hell of a tow pig. I have 140k miles on it. I love the truck. It will be nice to take it back toa dealer for woranty work......LOL

Rear end noise is gone. I've found that this rear end does not like the wrong lube. Use only what Chevy recomends, nothing else. And yes, I do have a title to this truck. It does say " Flood damaged". It fell thru the ice.

And what is the correct lube? I use Mobil 1 synthetic 75-90W. I don't care what the GM book says, that stalube hypoid gear oil sucks. I rather use roofing tar before I use sta lube.

The Quadrasteer rear end uses it's own lube, made only for the Quad by GM. Don't use the wrong lube, it causes problems.