Changing Transfer Case Oil

1. Raise and suitably support vehicle.





Important: It is not necessary to remove the transfer case skid plate in order to gain access to the transfer case drain plug. An access opening in the transfer case skid plate has been provided for wrench access as well as transfer case oil drainage.





2. Place a drain pan or suitable container underneath transfer case.
3. Remove transfer case oil level/filler plug from transfer case.
4. Remove transfer case drain plug from transfer case and drain transfer case oil.
5. Apply GM P/N 12346004, or equivalent, to the threaded portion of the transfer case drain plug.
6. Transfer case drain plug into transfer case.
- Transfer case drain plug to 23 Nm (17 ft. lbs.).
7. Add approximately 1.7 liters (1.8 qts.) of 75W-90 GL4 lubricant or equivalent, into the oil level/filler plug hole. Oil level should be even with the bottom of the oil level/filler plug hole.
8. Apply GM P/N 12346004, or equivalent, to the threaded portion of the transfer case oil level/filler plug.
9. Transfer case oil level filler plug into transfer case.
- Tighten transfer case oil level/filler plug to 23 Nm (17 ft. lbs.).
10. Lower vehicle.