Rear Axle; Four Wheel Drive; Transfer Case - GMC 2001 Yukon XL Owner's Manual

Rear Axle

When to Check Lubricant
Refer to the Maintenance Schedule to determine how
often to check the lubricant. Additional rear axle
scheduled maintenance is required when trailer towing.
See "Scheduled Maintenance Services" in the Index.
How to Check Lubricant
1500 Series shown, 2500 and 3500 Series similar
The proper level for the 1500 Series is from 5/8 inch to
1 5/8 inch (15 mm to 40 mm) below the filler plug.
The proper level for the 2500 Series is from 0 to 3/8 inch
(0 to 10 mm) below the filler plug. Add only enough fluid
to reach the proper level.
What to Use
Refer to the Maintenance Schedule to determine what
kind of lubricant to use. See "Recommended Fluids
and Lubricants" in the Index.
Four Wheel Drive
-
Most lubricant checks in this section also apply to
- -
four wheel drive vehicles. However, they have
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 "Periodic Maintenance
Inspections" in the Index.
6-25