1998 GMC Jimmy Owner's Manual - Page 292

Front Axle When to Check and Change Lubricant Refer to the Maintenance Schedule to determine how and often to check the lubricant when to changeit. See "Scheduled Maintenance Services" the Index. in When the differential is cold, enough lubricant to add raise the level to 1/2 inch (12mm) below the filler plug hole. at When the differential is operating temperature (warm), add enough lubricant to raise the level the to bottom of the fillerplug hole. What to Use Refer to the Maintenance Schedule to determine what kind of lubricant touse. See "Recommended Fluids and Lubricants" in the Index. How to Check Lubricant Engine Coolant The cooling s stem in your vehicle is filled with DEX-COOL engine coolant. This coolant is designed to remain in your vehicle for 5years or 150,000 miles (240 000 k )whichever occurs first, if you add only m DEX-COOL' extended life coolant. 2 The following explains your cooling system and how to add coolant when it is low. If you have aproblem with engine overheating, see "Engine Overheating" in the Index. If the levelis below the bottomof the filler plug hole, you may need to add some lubricant. 6-23