GMC 2007 Sierra - Manual (Page 575)

4. Make sure the jack head is positioned so that
the rear axle is resting securely between the
grooves that are on the jack head.
5. 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 fit under the wheel well.
Rear Position – 2WD Pickup Models Rear Position – All Other Models
575