K 2500 Truck 4WD V8-379 6.2L DSL VIN C FI (1989)
Fluid - Differential: All Technical Service Bulletins
Drivetrain - Rear Axle Lubricant Compatibility & Usage
File in Section: 04 - Driveline Axle
Bulletin No.: 99-04-20-001
Date: June, 1999
INFORMATION
Subject:
Rear Axle Lubricant Compatibility and Usage
Models:
1999 Cadillac Escalade
1988-99 Chevrolet and GMC C/K, G Van and P1-3 Series Models
Built after the VIN Breakpoints (C/K) listed.
This bulletin is being revised to add the 1999 Model Year, VIN Breakpoint information, and additional text Please discard Corporate Bulletin Number
86-42-04 (Section 4 - Driveline/Axle).
This bulletin is being issued to inform dealers about the compatibility and usage of the new Fuel Efficient SAE 75W-90 Synthetic Axle Lubricant, GM
P/N 12378261 (In Canada use P/N 10953455), with current axles, and with the non-synthetic axle lubricant, GM P/N 1052271 (In Canada use P/N
10950849), for the rear axles on the above light-duty trucks.
Testing has shown that the new synthetic lubricant will chemically attack the Room Temperature Vulcanizing (RTV) sealant. Use only the non-synthetic
lubricant, P/N 1052271, in axles using RTV sealant (See 9.5 and 10.5 information below).
American Axle and Manufacturing (A.A.M.) has approved the use of the new Fuel Efficient SAE 75W-90 synthetic axle lubricant for rear axles with the
following restrictions:
^
All 8.6 inch axles are compatible as originally built.
