1997 GMC Jimmy Owner's Manual - Page 281

Front Axle When to Check and Change Lubricant Refer to the Maintenance Schedule determine how to often to check the lubricant when to change it. See and "Scheduled Maintenance Services" the Index. in How to Check Lubricant If the level is below the bottomof the filler plug hole, you'll need to add same lubricant. If the differentialis at operating temperature (warm), add enough lubricant raise the level tothe bottom af to the filler plug hole. If the differential is cold, add enough lubricant raise to the level to 1/2 inch (12 mm) beluw the filler plug hole. What to Use Refer to the Maintenance Schedule determine what to kind of lubricant to use. See "Recommended Fluids and Lubricants" in the Index. 6-22