GMC Sierra Owners Manual

Four-Wheel Drive
Vehicle 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

GMS Sierra: Four-Wheel Drive. Electric Shift Transfer Case
Electric Shift Transfer Case

A. Fill Plug
B. Drain Plug

GMS Sierra: Four-Wheel Drive. Manual Shift Transfer Case
Manual Shift Transfer Case

A. Fill Plug
B. Drain Plug

GMS Sierra: Four-Wheel Drive. Active Transfer Case
Active Transfer Case

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.


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