Drive Axle - 7 5/8", 8.5", 8 5/8" & 9.5" Ring Gears: Lubrication
On all models except C and K series with standard differential, fill differential with 80W or 80W-90 GL-5 gear lubricant to within 1/4" (6 mm) below edge of filler hole.
Some C and K series rear standard differentials require the use of a synthetic gear lubricant. Differentials using synthetic gear oil come from factory equipped with a tag indicating the use of GM P/N 12378261 SAE 75W-90 Synthetic gear lubricant only. Otherwise use 80W or 80W-90 GL-5 gear lubricant. If tag does not exist and there is doubt as to which differential is used in vehicle. VIN must be used through dealership to determine differential usage.
Fill differential with appropriate amount of gear lubricant. See LUBRICATION CAPACITY SPECIFICATIONS table.
LUBRICATION CAPACITY SPECIFICATIONS
| Aplication | Specification | |
|---|---|---|
| "C" & "K" Series | ||
| 8 1/2" & 8 5/8" Ring Gear | 4.2 Pts. (2.0L) | |
| 9 1/2" Ring Gear | 5.5 Pts. (2.6L) | |
| "G" Series | ||
| 8 5/8" Ring Gear | 5.3 Pts. (2.5L) | |
| 9 1/2" Ring Gear | 5.9 Pts. (2.8L) | |
| "L" & "M" Series | 4.0 Pts. (1.9L) | |
| "S" & "T" Series | ||
| 7 5/8" Ring Gear | 3.8 Pts. (1.8L) | |
| 8 5/8" Ring Gear | 4.2 Pts. (2.0L) | |