GMC 2007 Yukon XL, Owner'S Manual

Page: 501 / 630

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For 6.0L engines, the proper level is from
0.6 inch to 1.6 inches (15 mm to 40 mm) below
the bottom of the filler plug hole, located on
the rear axle. Add only enough fluid to
reach the proper level.
•
The proper fill level for the 2500 Series is from
0 to 1/2 inch (0 to 13 mm) below the bottom of
the filler plug hole, located at the front of the
axle. Add only enough fluid to reach the proper
level.
Four-Wheel Drive
Lubricant checks in this section also apply to
these vehicles. There are two additional systems
that need lubrication.
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
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 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.
Automatic Transfer Case
501