All-Wheel Drive; Transfer Case - GMC 2008 Yukon Denali Owner's Manual

All-Wheel Drive

Transfer Case

If your vehicle is equipped with All-Wheel Drive, be sure
to perform the lubricant checks described in this section.
There are two additional systems that need lubrication.
When to Check Lubricant
Refer to the Maintenance Schedule to determine how
often to check the lubricant. See Scheduled
Maintenance on page 6-4.
How to Check Lubricant
(A) 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'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 on page 6-12.
(B) Filler Plug
5-45