System Specifications

Front Drive Axle (8.25" S4WD Axle)
GM P/N 89021671 (Canadian P/N 10950849) or SAE 80W-90 GL5

Front Drive Axle (8.25" F4WD Axle)
SAE 75W-90 Synthetic Axle Lubricant GM P/N 89021677 (Canadian P/N 89021678) or equivalent meeting GM Specification 9986115

Front Drive Axle (9.25" Axle)
SAE 75W-90 Synthetic Axle Lubricant GM P/N 89021677 (Canadian P/N 89021678) or equivalent meeting GM Specification 9986115

Rear Drive Axle
SAE 75W-90 Synthetic Axle Lubricant 89021677 (Canadian P/N 89021678) or equivalent meeting GM Specification 9986115