Eaton G80 problem
I am working on my brothers Silverado fixing multiple things. One problem is the locking differential isn't unlocking. I have read that contaminated fluid can cause it, but I also know they are prone ...
Forum Discussion
Lessmore wrote:
I had a G80 Locking axle. The important thing is when you do replace the gear oil, make sure it's the proper stuff as recommended by GM. When I first got it, I assumed it was a posi or a positraction limited slip.
I wanted to use gear oil for a posi, until the Chevy service manager corrected me. He told me that the truck line uses a G 80 Locker, the car line (back in the RWD days) uses a posi Limited slip....and there is specific and different gear oil for each.
exactly. GM makes a specific gear oil for the G80 diff, commonly refered to as "grape juice". Actually what it kinda smells like when you open a bottle. IIRC the G80 takes about 4 quarts.
Entirely different from the gear oil for a posi unit or open differential.
on both my duramax's with the G80 I drained and filled after about 1K miles (what GM used to recomend), then about every 50K miles.
