Chevrolet Avalanche Owner's Manual page 430

To store the flat or spare tire, do the following:
1. Put the tire on the ground at the rear of the vehicle
with the valve stem pointed down and toward the
rear of the vehicle.
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2. Tilt the retainer (D)
downward and through
the 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.
4. Insert the hoist end (F)
through the hole (G) in
the rear bumper and
into the hoist shaft.