GMC Sierra Owners Manual
Four-Wheel DriveVehicle Care / Vehicle Checks / Four-Wheel Drive
Transfer Case
When to Check Lubricant
Refer to Maintenance Schedule on page 11‑3 to determine when to check the lubricant.
How to Check Lubricant
A. Fill Plug
B. Drain Plug
A. Fill Plug
B. Drain Plug
A. Fill Plug
B. Drain Plug
To get an accurate reading, the vehicle should be on a level surface.
If the level is below the bottom of the fill plug hole, located on the transfer case, some lubricant will need to be added. Add enough lubricant to raise the level to the bottom of the fill plug hole. Use care not to overtighten the plug.
When to Change Lubricant
Refer to Maintenance Schedule on page 11‑3 to determine how often to change the lubricant.
What to Use
Refer to Recommended Fluids and Lubricants on page 11‑12 to determine what kind of lubricant to use.