GMC 2015 Sierra Denali Owner's Manual page 390

Usage
Automatic Transmission (6.2L with
8-Speed transmission)
Transfer Case (Four-Wheel Drive)
Floor Shift Linkage
Chassis Lubrication
Front Axle (1500 Series)
Four-Wheel Drive
Rear Axle (1500)
Front and Rear Axle (2500/3500)
Front Axle Driveshaft Splines (All
1500/2500/3500 Series) and Rear
Axle Driveshaft Splines (All 1500
Series with Automatic Transmission)
®
DEXRON -HP Automatic Transmission Fluid (GM Part No. 19300536, in
Canada 19300537).
®
DEXRON -VI Automatic Transmission Fluid.
Lubriplate Lubricant Aerosol (GM Part No. 89021668, in Canada 89021674)
or lubricant meeting requirements of NLGI #2 Category LB or GC-LB.
Chassis Lubricant (GM Part No. 12377985, in Canada 88901242) or
lubricant meeting requirements of NLGI #2, Category LB or GC-LB.
SAE 80W-90 Axle Lubricant (GM Part No. 89021671, in
Canada 89021672).
SAE 75W-85 Synthetic Axle Lubricant (GM Part No. 19300457, in
Canada 19300458).
SAE 75W-90 Synthetic Axle Lubricant (GM Part No. 88900401, in
Canada 89021678).
Spline Lubricant, Special Lubricant (GM Part No. 19257121, in
Canada 19257122).
Service and Maintenance
Fluid/Lubricant
11-13