GMC Sierra Denali 2009 Owner's Manual page 442

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.
5-102
3. Attach the wheel wrench (H) and extensions (I)
together, as shown.