2006 GMC Sierra 1500 Pickup Owner's Manual - Page 126

See Tow/Haul Mode Light on page 3-50 for more information. If your vehicle is equipped with the Performance Package-Enhanced Towing, activating the manual selectable ride will adjust the shock absorber characteristics to enhance the ride and handling of the vehicle for towing or hauling heavy loads. Also see Tow Haul Mode under Towing a Trailer on page 4-67 for more information. If your vehicle has an Allison Transmission®, it may have a Tow/Haul mode. Tow/Haul mode adjusts the transmission shift pattern to reduce shift cycling, providing increased performance, vehicle control, and transmission cooling when towing or hauling heavy loads. The selector button is located on the end of the shift lever. Turn the Turn Tow/Haul on and off by pressing the button. When the Tow/Haul is on, a light on the instrument panel cluster will come on. See Tow/Haul Mode Light on page 3-50 for more information. Also see "Tow Haul Mode" under Towing a Trailer on page 4-67 for more information. Tow/Haul Mode (Allison Transmission®) 2-32