2002 Chevrolet Silverado 1500 Pickup Owner's Manual - Page 397

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. 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. The proper level for the 2500 Series is from 0 to 3/8 inch (0 to 10 mm) below the bottom of the filler plug hole. The proper level for the 2500 HD and 3500 Series is just below the bottom of the filler plug hole. Add only enough fluid to reach the proper level. How to Check Lubricant 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 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. 1500 Series Shown, 2500 Series Similar To get an accurate reading, the vehicle should be on a level surface. 6-32