2010 Hummer H3T Owner's Manual - Page 357

Vehicle Care Use the following procedure to tow the vehicle: 1. Put the transmission in P (Park) for an automatic transmission or in 1 (First) for a manual transmission. 2. Turn the engine off, but leave the ignition in ACC/ ACCESSORY. 3. Firmly set the parking brake. 4. Securely attach the vehicle being towed to the tow vehicle. 5. Shift the transfer case to N (Neutral). See Four-Wheel Drive on page 9‑46 for the proper procedure to select the N (Neutral) position for the vehicle. 6. Release the parking brake only after the vehicle being towed is firmly attached to the tow vehicle. 7. Make sure the ignition is in ACC/ACCESSORY. When towing the vehicle for extended periods of time, start the vehicle as often as possible to prevent battery drain. This should only be done when the tow vehicle is parked. After towing, see "Shifting Out of NEUTRAL" under Four-Wheel Drive on page 9‑46. 10-91 Dolly Towing { WARNING Shifting a full‐time four‐wheel‐ drive vehicle's transfer case into N (Neutral) can cause the vehicle to roll even if the automatic transmission is in P (Park) or the manual transmission is in any gear. You or others could be injured. Make sure the parking brake is firmly set before the transfer case is shifted to N (Neutral). Notice: Dolly towing the vehicle will damage drivetrain components. Do not dolly tow the vehicle. The vehicle cannot be dolly towed. If the vehicle must be towed behind another vehicle, use the dinghy towing procedure explained previously.