GMC Sierra 2014 Owner's Manual page 486

11-14 Service and Maintenance
Usage Fluid/Lubricant
Floor Shift Linkage Lubriplate Lubricant Aerosol (GM Part No. 89021668, in Canada 89021674)
or lubricant meeting requirements of NLGI #2 Category LB or GC-LB.
Chassis Lubrication Chassis Lubricant (GM Part No. 12377985, in Canada 88901242) or
lubricant meeting requirements of NLGI #2, Category LB or GC-LB.
Front Axle (1500 Series) SAE 80W-90 Axle Lubricant (GM Part No. 89021671, in
Four-Wheel Drive Canada 89021672).
Front Axle (2500/3500) SAE 75W-90 Synthetic Axle Lubricant (GM Part No. 89021677, in
Canada 89021678).
Rear Axle (1500) SAE 75W-85 Synthetic Axle Lubricant (GM Part No. 19300457, in
Canada 19300458).
Rear Axle (2500/3500) SAE 75W-90 Synthetic Axle Lubricant (GM Part No. 89021677, in
Canada 89021678).
®
Transfer Case (Four-Wheel Drive) DEXRON -VI Automatic Transmission Fluid.
Front Axle Driveshaft Splines Spline Lubricant, Special Lubricant (GM Part No. 19257121, in
(All 1500/2500/3500 Series) and Canada 19257122).
Rear Axle Driveshaft Splines
(All 1500 Series with Automatic
Transmission)