Chevrolet 2009 Colorado, Owner'S Manual, Page: 295 / 418

A. Drain Plug
B. Filler Plug
If the level is below the bottom of the filler plug hole,
located on the transfer case, 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 6-12.
Front Axle
When to Check and Change Lubricant
It is not necessary to regularly check your 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.
How to Check Lubricant
To get an accurate reading, the vehicle should be on a
level surface.
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