K 2500 Truck 4WD V8-379 6.2L DSL VIN C FI (1989)
Fluid - Differential: Fluid Type Specifications
Front Axle
SAE 80W-90 GL5 Gear Lubricant. GM P/N 1052271
Locking Differential (G80)
This Article has been updated by TSB # 76-02-02A.
SAE 80W-90 GL5 Gear Lubricant, GM P/N 1052271. Do not use limited slip additive.
Non-Locking Differential
Rear Axle with Non Limited Slip or Non Locking Differentials
HD-3500 Trucks (Dana 11.0 axles)
Recommended Lubricant - GM P/N 12346140, SAE 75W-140 Synthetic Gear Lubricant.
1999 GMT 800 Trucks
Recommended Lubricant - GM P/N 12378261, SAE 75W-90 Synthetic Axle Lubricant.
All other non limited-slip or non locking differentials including B and D cars, S/T, M/L, G, P, and C/K trucks except GMT 800 trucks, and as noted
above.
Recommended Lubricant - GM P/N 1052271 or an SAE 80W90 GL-5 Gear Lubricant.
