July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Fluid Type Specifications

Front Axle 1500 Series SAE 80W-90 Axle Lubricant
U.S. GM Part Number 89021671
Canada GM Part Number 89021672

Front Axle 2500 Series SAE 75W-90 Synthetic Axle Lubricant
U.S. GM Part Number 89021677
Canada GM Part Number 89021678

Rear Axle SAE 75W-90 Synthetic Axle Lubricant
U.S. GM Part Number 89021677
Canada GM Part Number 89021678