Front Axle - GMC 2008 Envoy Denali Owner's Manual

What to Use
To determine what kind of lubricant to use, see
Recommended Fluids and Lubricants on page 6-12.

Front Axle

When to Check Lubricant
It is not necessary to regularly check front axle 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.
5-48
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,
located on the front axle, you may need to add some
lubricant.
When the differential is cold, add enough lubricant to
raise the level to 0.50 inch (12 mm) below the filler
plug hole.
When the differential is at operating temperature (warm),
add enough lubricant to raise the level to the bottom of
the filler plug hole.