2010 GMC Sierra 1500 Crew Cab Owner's Manual - Page 27

Press the plus/minus buttons, located on the steering column shift lever, to select the desired range of gears for current driving conditions. See Automatic Transmission Operation on page 3‑30. While using Range Selection Mode, cruise control and the Tow/Haul mode can be used. Grade Braking is not available when Range Selection Mode is active. See Tow/Haul Mode on page 3‑36. Manual Transfer Case Four-Wheel Drive If the vehicle has Four-Wheel Drive, you can send the engine's driving power to all four wheels for extra traction. Transfer Case Buttons The vehicle will have one of these three styles of transfer case controls. Use these controls to shift into and out of the different Four-Wheel Drive modes. This transfer case shift lever is on the floor to the right of the driver. 1-21