2004 GMC Envoy Owner's Manual - Page 290

Dolly Towing Two-Wheel-Drive Vehicles Two-wheel-drive vehicles should not be dolly towed. 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. {CAUTION: Shifting a four-wheel-drive vehicle's transfer case into NEUTRAL can cause your vehicle to roll even if the transmission is in Park (P). You or others could be injured. Make sure the parking brake is firmly set before you shift the transfer case to NEUTRAL. 6. Shift the transfer case to NEUTRAL. See Four-Wheel Drive on page 2-26 for the proper procedure to select the NEUTRAL position for your vehicle. 7. Release the parking brake only after the vehicle being towed is firmly attached to the towing vehicle. 8. Turn the ignition off and lock the steering column. Four-Wheel-Drive Vehicles Four-wheel-drive vehicles can be dolly towed with the rear wheels on the ground. Use the following procedure to tow your vehicle: 1. Drive the vehicle onto the tow dolly. 2. Shift the automatic transmission to PARK (P). 3. Turn the engine off, but leave the ignition on. 4. Firmly set the parking brake. 5. Securely attach the vehicle being towed to the dolly. 4-48