2006 Chevrolet Silverado 1500 Pickup Owner's Manual - Page 125

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 3-49 for more information. Also see "Tow Haul Mode" under Towing a Trailer on page 4-67 for more information. Cruise Grade Braking is available on the 6.6L DURAMAX® diesel engine. Cruise Grade Braking monitors a vehicle's cruise state, engine torque, acceleration, vehicle speed, and the cruise set speed. Using this information, it detects when the truck is accelerating on a downhill grade and will automatically downshift to slow the vehicle if it exceeds the cruise set speed by a certain amount. See Cruise Control on page 3-10 for more information. The Tow/Haul mode and Grade Braking shift modes can be activated by pressing the button on the front of the shift control stalk. If your vehicle has the DURAMAX® Diesel Engine or the 8.1L Vortec gasoline engine, Grade Braking is only available while the Tow/Haul Mode is selected. While in the Range Selection Mode, Grade Braking is deactivated allowing the driver to select a desired gear. See Automatic Transmission Operation on page 2-24 for more information. Also see Towing a Trailer on page 4-67 for more information. Grade Braking and Cruise Grade Braking (Allison Transmission®) Grade Braking and Cruise Grade Braking assists when driving on a downhill grade. It maintains the vehicle's speed by automatically implementing a shift schedule that uses the engine and the transmission to slow the vehicle. This reduces wear on the brakes system and increases control of the vehicle. The system constantly monitors the vehicle's speed, acceleration, engine torque, and brake pedal usage. It detects when the truck is on a downhill grade and the driver's desire to slow down by pressing the brake. 2-31