GMC 2005 Envoy Owner's Manual page 411

Follow this diagram to store the underbody-mounted
spare.
1. Put the tire on the ground at the rear of the vehicle,
with the valve stem pointed up and to the rear.
2. Pull the retainer (D) through the wheel.
3. Put the socket end of the extension (C), on an
45 degree angle downward, through the hole in
the rear bumper and into the hoist shaft (B).
4. Raise the tire fully against the underside of the
vehicle. Continue turning the wheel wrench (A)
clockwise until you hear two clicks or feel it skip
twice. This indicates that the tire is secure and the
cable is tight. The spare tire hoist cannot be
overtightened.
A. Wheel Wrench
B. Hoist Shaft
C. Extension(s)
D. Retainer
E. Spare or Flat Tire
(Valve Stem
Pointed Up)
5. Make sure the tire is stored securely. Push, pull (A),
and then try to turn (B) the tire. If the tire moves,
use the wheel wrench and socket end of the
extension to tighten the cable.
5-79