2010 GMC Yukon Owner's Manual - Page 6

Initial Drive Information Transmission Range Selection Mode The current range will appear next to the M. This is the highest attainable range with all lower gears accessible. As an example, when 3 (Third) gear is selected, 1 (First) through 3 (Third) gears are available. 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 in the owner manual. Cruise control can be used while the vehicle is in Range Selection Mode. 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. Read the following before using four-wheel drive. The Range Selection Mode switch is located on the shift lever. To enable the Range Selection feature, move the column shift lever to the M (Manual) position. 1-2