2013 Chevrolet Silverado 1500 Crew Cab Owner Manual - Page 405

Vehicle Care 10-29 Four-Wheel Drive Transfer Case When to Check Lubricant Refer to Maintenance Schedule on page 11‑3 to determine when to check the lubricant. How to Check Lubricant Manual Shift Transfer Case A. Fill Plug B. Drain Plug Active Transfer Case A. Fill Plug B. Drain Plug To get an accurate reading, the vehicle should be on a level surface. If the level is below the bottom of the fill plug (A) hole, located 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 (A) hole. Use care not to overtighten the plug. Electric Shift Transfer Case A. Fill Plug B. Drain Plug