1996 Chevrolet Astro Owner's Manual - Page 229

A//- Wheel Drive If you have an all-wheel-drive vehicle, be sure toperform the lubricant checks described in this section. However, they have two additional systems that need lubrication. Transfer Case When to Check Lubricant Refer to the Maintenance Schedule to determinehow often to check the lubricant. See "Periodic Maintenance Inspections'' in the Index. How to Check Lubricant If the levelis below the bottom of the filler plug hole, you'll need to add some lubricant. Add enough lubricant to raisethe level to the bottom of the filler plug hole. What to Use Refer to theMaintenance Schedule to determine what kind of lubricant to use. See "Recommended Fluids and Lubricants" in the Index. Front Axle When to Check and Change Lubricant Refer to the Maintenance Schedule to determinehow often to check the lubricant and when to change it. See "Scheduled Maintenance Services'' in the Index. 6-21