Front Axle - Hummer 2003 H2 Owner's Manual

Front Axle

When to Check Lubricant
Refer to the Maintenance Schedule to determine how
often to check the lubricant. See "Scheduled Maintenance
Services" in the Index.
How to Check Lubricant
6-24
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 may need to add some lubricant.
When the differential is cold, add enough lubricant
to raise the level to 1/2 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.
What to Use
Refer to the Maintenance Schedule to determine what
kind of lubricant to use. See "Recommended Fluids and
Lubricants" in the Index.