2004 GMC Sierra 1500 Pickup Owner's Manual - Page 502

Jacking Locations A. Front Location (2-Wheel Drive 1500 Series) B. Front Location (All Other Series) C. Rear Location (All Series) 3. Position the jack under the vehicle as shown. If the flat tire is on the front of the vehicle (Two-Wheel Drive 1500 Series vehicles), position the jack under the bracket attached to the vehicle's frame, behind the flat tire. If the flat tire is on the front of the vehicle (all other models), position the jack on the frame behind the flat tire. If the flat tire is on the rear, position the jack under the rear axle between the spring anchor and the shock absorber bracket. If you have added a snow plow to the front of your vehicle, lower the snow plow fully before raising the vehicle. 2. Use the wheel wrench to loosen all the wheel nuts. Turn the wheel wrench counterclockwise to loosen the wheel nuts. Don't remove the wheel nuts yet. Notice: If your vehicle has QUADRASTEER™ and you use a jack to raise the vehicle without positioning it correctly, you could damage the QUADRASTEER™ system. When raising your vehicle on a jack, avoid contact with tie rods and tie rod boots. 5-102