2009 Chevrolet Silverado 2500 HD Extended Cab Owner's Manual - Page 134

Tow/Haul Mode Also see Tow Haul Mode under Towing a Trailer on page 4-50 for more information. Tow/Haul Mode (Allison Transmission® or Hydra-Matic® 6-Speed Automatic Transmission) Vehicles with an automatic transmission have a tow/haul mode. The 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 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 3-51 for more information. 2-34 Vehicles with an Allison or Hydra-Matic® 6-speed automatic transmission® have a tow/haul mode. The 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.