2013 Chevrolet Express 1500 Cargo Owner Manual - Page 276

10-28 Vehicle Care Front Axle When to Check and Change Lubricant Refer to the Maintenance Schedule to determine how often to check the lubricant and when to change it. See Maintenance Schedule on page 11‑3. How to Check Lubricant 1. Drain Plug 2. Fill Plug If the level is below the bottom of the fill plug hole, on the transfer case, some lubricant will need to be added. Add enough lubricant to raise the level to the bottom of the fill plug hole. Use care not to overtighten the plug. What to Use Refer to Recommended Fluids and Lubricants on page 11‑12 to determine what kind of lubricant to use. To get an accurate reading, the vehicle should be on a level surface. If the level is below the bottom of the fill plug hole, some lubricant may need to be added. When the differential is cold, add enough lubricant to raise the level to 10 mm (3/8 in) below the fill plug hole. When the differential is at operating temperature (warm), add enough lubricant to raise the level to the bottom of the fill plug hole. What to Use Refer to Recommended Fluids and Lubricants on page 11‑12 to determine what kind of lubricant to use. Rear Axle When to Check Lubricant Refer to the Maintenance Schedule on page 11‑3 to determine how often to check the lubricant.