2003 GMC Sierra 1500 Pickup Owner's Manual - Page 518

Usage Automatic Transmission Key Lock Cylinders Fluid/Lubricant DEXRON-Ill Automatic Transmission Fluid. Mulit-Purpose Lubricant, Superlube (GM Part No. U.S. 12346241, in Canada 10953474, or equivalent). Lubriplate Lubricant Aerosol (GM Part No. U.S. 12346293, in Canada 992723, or equivalent) or lubricant meeting requirements of NLGI #2 Category LB or GC-LB. Chassis Lubricant (GM Part No. U.S. 12377985, in Canada 88901242, or equivalent) or lubricant meeting requirements of NLGl #2, Category LB or GC-LB. SAE 80W-90 Axle Lubricant (GM Part No. U.S. 1052271, in Canada 10950849 or equivalent). SAE 75W-90 Synthetic Axle Lubricant (GM Part No. U.S. 12378261, in Canada 10953455) or equivalent meeting GM Specification 9986 115. Usage Rear Axle (Steerable) Manual Transfer Case Automatic Transfer Case Front Axle Propshaft Spline or One-Piece Propshaft Spline (Two-Wheel Drive with Auto. Trans.) Rear Driveline Center Spline Fluid/Lubricant Synthetic Axle Lubricant; use only GM Part No. 12378557 (in Canada, 88901362). Do not add friction modifier. DEXRON-Ill Automatic Transmission Fluid. AUTO-TRAK II Fluid (GM Part No. U.S. 12378508, in Canada 10953626). Floor Shift Linkage Chassis Lubrication Spline Lubricant, Special Lubricant (GM Part No. U.S. 12345879, in Canada 1095351 1) orlubricant meeting requirements of GM 9985830. Front Axle Rear Axle Chassis Lubricant (GM Part No. U.S. 12377985, in Canada 88901242, or equivalent) or lubricant meeting requirements of NLGl #2, Category LB or GC-LB. 6-19