2009 Chevrolet Silverado 2500 HD Extended Cab Owner's Manual - Page 375

Dolly Towing { CAUTION: Shifting a four-wheel-drive vehicle's transfer case into N (Neutral) can cause the vehicle to roll even if the transmission is in P (Park). The driver or others could be injured. Make sure the parking brake is firmly set before the transfer case is shifted to N (Neutral). 4. Shift the transfer case to N (Neutral). See "Shifting into Neutral" under Four-Wheel Drive on page 2-36 for the proper procedure to select the Neutral position for the vehicle. 5. Release the parking brake only after the vehicle being towed is firmly attached to the towing vehicle. 6. Turn the ignition to LOCK/OFF and remove the key - the steering wheel will still turn. After towing, see "Shifting Out of Neutral" under Four-Wheel Drive on page 2-36 for the proper procedure to take the vehicle out of the Neutral position. Front Towing (Front Wheels Off the Ground) Two-Wheel-Drive Vehicles Notice: If a two-wheel-drive vehicle is towed with the rear wheels on the ground, the transmission could be damaged. The repairs would not be covered by the vehicle warranty. Never tow the vehicle with the rear wheels on the ground. Two-wheel-drive vehicles should not be towed with the rear wheels on the ground. Two-wheel-drive transmissions have no provisions for internal lubrication while being towed. 4-47