I have the same rear and have no truble at 38k,,I'm told by the dealer I don't need to change for 150k even with towing,,,I have 100k 7 year warranty,if it goes I'll spring the $100 for a new one
BigBearZ71 wrote: As far as I know that diff does require the GM additive, All GM Locking Diffs require it, I would change it and add the additive and that should fix all your quirkiness with that rearend good luck hope that helps
J
Not true. Only GM limited slips require additive. The G-80 in the trucks is a locker and additive is not needed nor recomended by Eaton who makes the G-80. Call Eaton support and talking to a tech. There is a procedure to deglazed the clutch plates. The plates on the heavy duty trucks are all metal and can become glazed. I had the same problem and I did the procedure. I believe the tech had me get one rear tire in dirt and one on asphalt. Then give the truck enough gas to get the diff. to lock up. He had me do it about 10-15 times with the left wheel in dirt and then 10-15 times with the right wheel in dirt. After that I changed the fluid and the problem was gone and has never returned. You can call eaton and make sure I explained it right because I did mine 2 years ago. He said some people automatically think it needs the additive and although it gets rid of the shudder it can actually make the diff. malfuntion. He said DO NOT add any additive to it.
For the record my truck did it with the original grape juice in it. I replaced it with the GM fluid because my truck was under warranty at the time so Eaton suggested putting it back in until the warranty was up so GM couldn't use the lube as an excuse if something went wrong. Eaton told me after warranty that any good quality synthetic fluid would be fine.
Bryan
2003 2500HD Ext. cab short box
6.0 liter 4.10 gears, Nelson performance PCM
98 K1500 4x4 heavy duty 1/2 ton
6,600lb GVWR 5,280lbs on the scale empty
14 bolt rear diff. 3:73 , Tranny and oil coolers
250,000 miles still purrin' like a kitten
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