I have a 99 Z71 with 5.3L and 4L60E. I need to change the fluids in the front diff, rear diff, and transfer case. Do I really need three different fluids? My rear diff is a limited slip (4.10) and calls for 75W-90 Synthetic. GM spec 12378261. Front diff calls for 80W-90 GM Spec 1052271 and the transfer case is one of those auto shift with the switch on the dash that calls for GM 12378396. (Read: Dealer only!) My cheapo "capacities" chart doesn't tell me how much to buy, either. Is there a common fluid for all three of these? I gotta do the front pinion seal too and so far it looks like I have to shell out to a dealer for the seal and a new nut! Dang it!
- posted
20 years ago