2014 Chevrolet Silverado 3500 HD Crew Cab Owner Manual - Page 394

10-28 Vehicle Care How to Check Lubricant Manual Shift Transfer Case Electric Shift Transfer Case A. Fill Plug B. Drain Plug 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.