1998 Chevrolet Blazer Owner's Manual - Page 292

Four-wheel Drive Most lubricant checks in this section also apply to four-wheel-drive vehicles. However, they have two additional systems that need lubrication. How to Check Lubricant Transfer Case When to Check Lubricant Refer to theMaintenance Schedule to determine how often to check the lubricant. See "Periodic Maintenance Inspections" in the Index. If the levelis below the bottom of the filler plug hole, you'll need to add somelubricant. Add enough lubricant to raise the level to the bottom the filler plug hole. of What to Use Refer to the Maintenance Schedule to determine what kind of lubricantto use. See "Recommended Fluids and Lubricants" in the Index. 6-22