GM Service Manual Online
For 1990-2009 cars only

Lubricant checks in this section also apply to these vehicles.

Transfer Case

When to Check Lubricant

It is not necessary to regularly check transfer case fluid unless you suspect there is a leak, or you hear an unusual noise. A fluid loss could indicate a problem. Have it inspected and repaired.

How to Check Lubricant

Electric Shift Transfer Case


Object Number: 1791926  Size: B3
  1. Fill Plug

  2. Drain Plug

Manual Shift Transfer Case


Object Number: 1791923  Size: B3
  1. Fill Plug

  2. Drain Plug

Active Transfer Case


Object Number: 1791915  Size: B3
  1. Fill Plug

  2. Drain Plug

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, located on the transfer case, you will 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.

When to Change Lubricant

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

What to Use

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