GM Service Manual Online
For 1990-2009 cars only

Lubricant checks in this section also apply to these vehicles. However, there are two additional systems that need lubrication.

Transfer Case

When to Check Lubricant

Refer to the Maintenance Schedule to determine how often to check the lubricant. See Scheduled Maintenance .

How to Check Lubricant

AWD Transfer Case (A) Fill Plug (B) Drain Plug


Object Number: 805392  Size: B3

To get an accurate reading, the vehicle should be on a level surface.

If the level is below the bottom of the filler plug hole, you'll need to add some lubricant. Add enough lubricant to raise the level to the bottom of the filler plug hole. Use care not to overtighten the plug.

What to Use

Refer to the Maintenance Schedule to determine what kind of lubricant to use. See Recommended Fluids and Lubricants .