2010 GMC Yukon Owner's Manual - Page 52

Four-Wheel-Drive Vehicles { 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). 5. Shift the transfer case to N (Neutral). See "Shifting into N (Neutral)" under Four-Wheel Drive on page 3‑10. 6. Secure the vehicle to the dolly following the manufacturer's instructions. Use the following procedure to dolly tow a four-wheel-drive vehicle from the front: 1. Attach the dolly to the tow vehicle following the dolly manufacturer's instructions. 2. Drive the front wheels onto the dolly. 3. Shift the transmission to P (Park). 4. Firmly set the parking brake. See "Parking Brake" in the owner manual index. 7. Release the parking brake only after the vehicle being towed is firmly attached to the towing vehicle. 8. Turn the ignition to LOCK/OFF. After towing, see "Shifting Out of N (Neutral)" under Four-Wheel Drive on page 3‑10. 5-6