jreagan wrote:I'm almost certain that the G80 is indeed an Eaton locker. I had the rear diff fluid changed and there was no friction modifier added. I've always assumed that GM's RPO description was just off. There are real limited slips diffs in GM passenger cars, etc. (ie, clutch plates, etc.) but I've always believed the G80 is an Eaton locker (and seems to be just that on my Silverado).
I've looked at the Eaton site and vendors who sell Eaton diffs. Nowhere does Eaton or the vendors call the Eaton mechanical locker a G80. I think the Eaton mechanical locker has picked up the G80 badge because og the GM RPO assignment. I don't know if the Eaton mech lockers were offered in 2004. So G80 in that year may heve meant the lim/slip diff.