Chevrolet 2003 Avalanche Owner's Manual page 457

Usage
Automatic
Transfer Case
Front Axle
Propshaft
Spline or
One-Piece
Propshaft
Spline
(Two-Wheel
Drive with Auto.
Trans.)
Fluid/Lubricant
AUTO-TRAK II Fluid (GM Part
No. U.S. 12378508, in Canada
10953626).
Spline Lubricant, Special Lubricant
(GM Part No. U.S. 12345879, in
Canada 1095351 1) or lubricant
meeting requirements of
G M 9985830.
Synthetic Grease with Teflon,
Weatherstrip
equivalent).
Superlube (GM Part No. U.S.
Squeaks
12371 287, in Canada 10953437, or
6-1 8