All-Wheel Drive
When to Check Lubricant
It is not necessary to regularly check 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, located on the transfer case, you’ll 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.
What to Use
To determine what kind of lubricant to use.
See also:
Managing the Vehicle DamageRepair Process
In the event that your vehicle requires damage
repairs, GM recommends that you take an active
role in its repair. If you have a pre-determined
repair facility of choice, take your vehicle there, or ...
Hill and Mountain Roads
Driving on steep hills or mountains is different
from driving in flat or rolling terrain.
If you drive regularly in steep country, or if you are
planning to visit there, here are some tips that
...
How OnStar Service Works
Automatic Crash Response,
Emergency Services, Crisis Assist,
Stolen Vehicle Assistance, Vehicle
Diagnostics, Remote Door Unlock,
Roadside Assistance, Turn-by-Turn
Navigation, and Hands-Free ...
