GMC 2004 Canyon - Manual (Page 312)

Four-Wheel Drive
Lubricant checks in this section also apply to these
vehicles. However, there are two additional systems
that need lubrication.
Transfer Case
When to Check Lubricant
Refer to the Maintenance Schedule to determine how
often to check the lubricant. See Additional Required
Services on page 6-6.
How to Check Lubricant
To get and accurate reading, the vehicle should be on a
level service.
If the level is below the bottom of the filler plug hole, you’ll
need to add some lubricant. Remove the plug and 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 6-13.
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