2008 GMC Envoy Owner's Manual - Page 280

4. Securely attach the vehicle being towed to the tow vehicle. Dolly Towing Front Towing (Front Wheels Off the Ground) Two-Wheel-Drive Vehicles Notice: If you tow a two-wheel-drive vehicle with the rear wheels on the ground, the transmission could be damaged. The repairs would not be covered by your warranty. Never tow your vehicle with the rear wheels on 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. 5. Shift the transfer case to NEUTRAL (N). See Four-Wheel Drive on page 2-29 for the proper procedure to select the NEUTRAL (N) position for your vehicle. 6. Release the parking brake only after the vehicle being towed is firmly attached to the towing vehicle. 7. Turn the ignition off. After towing, see "Shifting Out of Neutral" under Four-Wheel Drive on page 2-29. 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. 4-42