2006 Hummer H3 Owner's Manual - Page 344

4. Assemble the jack and tools as follows: Front Position Front Tire Flat: If the flat tire is on a front tire of the vehicle, you will need to use the jack handle and both jack handle extensions. Attach the wheel wrench to the jack handle extension. Attach the jack handle to the jack. Position the jack on the front lower control arm along the bar that runs front to back. Turn the wheel wrench clockwise to raise the vehicle. Raise the vehicle far enough off the ground so there is enough room for the spare tire to clear the ground. Rear Positions Refer to the graphic above to locate the placement of the jack if the flat tire is on the rear of the vehicle. 5-78