2006 GMC Sierra 1500 Pickup Owner's Manual - Page 124

Range Selection Mode (Allison Transmission®) The Range Selection Mode allows you to control the vehicle's engine and vehicle speed while driving down hill by allowing you to select a desired gear. The DIC shows the six available ranges with the highest attainable range shown in brackets. See Driver Information Center (DIC) on page 3-52 and DIC Operation and Displays on page 3-53 for more information. While using the Range Selection mode feature, cruise control and the Tow/Haul mode can be used. Low Traction Mode (Allison Transmission®) If your vehicle has the DURAMAX® diesel engine and the Allison Transmission®, it is equipped with a Low Traction Mode that assists in vehicle acceleration when road conditions are slippery, such as ice or snow. While at a stop, selecting the second gear range using the Range Selection system, will allow the Allison Transmission® to limit torque to the wheels after it detects wheel slip, preventing the tires from spinning. Notice: Spinning the tires or holding the vehicle in one place on a hill using only the accelerator pedal may damage the transmission. If you are stuck, do not spin the tires. When stopping on a hill, use the brakes to hold the vehicle in place. If your truck has an Allison Transmission® your vehicle is equipped with a Range Selection System. To use this feature, do the following: 1. Move the shift lever to the MANUAL MODE (M). When in the MANUAL MODE, the transmission's current gear range will be the highest attainable range with all the lower gears available. 2. Press the plus/minus buttons to upshift or downshift selecting the desired range of gears for your current driving conditions. 2-30