2011 Chevrolet Silverado 1500 Regular Cab Owner's Manual - Page 507

Vehicle Care 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 9‑50 for the proper procedure to take the vehicle out of the Neutral position. 10-101 Dolly Towing Front Towing (Front Wheels Off the Ground) - Two-Wheel-Drive Vehicles 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. To dolly tow a two‐wheel‐drive vehicle, the vehicle must be towed with the rear wheels on the dolly. See "Rear Towing (Rear Wheels Off the Ground)" later in this section for more information. 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.