2002 Cadillac Escalade Owner's Manual - Page 325

Rear Axle When to Check Lubricant Refer to the Maintenance Schedule to determine how often to check the lubricant. See "Scheduled Maintenance Services" in the Index. To get an accurate reading, the vehicle should be on a level surface. The proper level is from 5/8 inch to 1 5/8 inch (15 mm to 40 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. How to Check Lubricant All-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 "Periodic Maintenance Inspections" in the Index. If the level is below the bottom of the filler plug hole, you'll need to add some lubricant. 6-24