1996 Chevrolet Tahoe Owner's Manual - Page 276

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. Add enough lubricant to raise the level to the bottom of the filler plug hole. 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 Front Axle When to Check and Change Lubricant Refer to the Maintenance Schedule to determine how often to checkthe lubricant and when to change it. See "Scheduled Maintenance Services'' inthe Index. 6-23