2002 Chevrolet Avalanche Owner's Manual - Page 260

Dolly Towing (Two-Wheel Drive Vehicle Only) 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 properly tow these vehicles, they should be placed on a platform trailer with all four wheels off the ground. In rare cases when it's unavoidable that a two-wheel drive vehicle is to be towed with the rear wheels on the ground, the propeller shaft axle yoke orientation should be marked and the propeller shaft removed following the applicable service manual removal/installation procedure. Dust or dirt can enter the back of the transmission through the opening created by removing the propeller shaft if proper protection is not provided. Also, check the transmission fluid level before driving the truck. When the vehicle is properly attached to the tow vehicle and is ready to be towed, turn the ignition to LOCK. Clamp the steering wheel in a straight-ahead position with a clamping device designed for towing. Two-Wheel Drive Only 4-49