GMC 2010 Sierra Owner's Manual page 577

1. Put the tire on the ground at the rear of the
vehicle with the valve stem pointed down, and to
the rear.
2. Separate the tire/wheel retainer (D) from the guide
pin. Pull the pin through the center of the wheel.
Tilt the retainer down and through the center wheel
opening.
Make sure the retainer is fully seated across the
underside of the wheel.
3. Attach the wheel wrench (H) and extensions (I)
together, as shown.
6-117