2012 Chevrolet Avalanche Owner's Manual - Page 416

10-86 Vehicle Care Four-Wheel Drive Vehicles with a Two Speed Automatic Transfer Case Two-wheel-drive vehicles and four-wheel drive vehicles with a single speed automatic transfer case should not be towed with all four wheels on the ground. Two-wheel-drive transmissions have no provisions for internal lubrication while being towed. Four-wheel drive vehicles with a single speed automatic transfer case have no neutral position and will spin the transmission when the rear wheels turn. { WARNING 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" 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. Use the following procedure to dinghy tow a four-wheel drive vehicle with a two speed automatic transfer case: 1. Position the vehicle being towed behind the tow vehicle and shift the transmission to P (Park). 2. Turn the engine off and firmly set the parking brake. 3. Securely attach the vehicle being towed to the tow vehicle.