Four-Wheel Drive - Chevrolet 2006 Avalanche Owner's Manual

How to Check Lubricant
1500 Series shown, 2500 Series similar
To get an accurate reading, the vehicle should be on a
level surface.
The proper level for the 1500 Series is from 5/8 inch to
1 5/8 inch (15 mm to 40 mm) below the bottom of
the filler plug hole, located on the rear axle. The proper
level for the 2500 Series is from 0 to 1/2 inch (0 to
13 mm) below the bottom of the filler plug hole. Add only
enough fluid to reach the proper level.
5-50
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.

Four-Wheel Drive

Transfer Case
It is not necessary to regularly check transfer case 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.
Refer to the Maintenance Schedule to determine how
often to change the lubricant. See Scheduled
Maintenance on page 6-4.