GMC Yukon 2021 Owner's Manual page 361

360 Vehicle Care
3. Assemble the jack handle extensions (4)
and wheel wrench (5), as shown.
4. Insert the open end of the extension (7)
through the hole in the rear bumper (8)
(hoist shaft access hole).
Be sure the hoist end of the extension
(7) connects to the hoist shaft. The
ribbed square end of the extension is
used to lower the spare tire.
5. Turn the wheel wrench counterclockwise
to lower the spare tire to the ground.
Continue to turn the wheel wrench until
the spare tire can be pulled out from
under the vehicle.
6. Pull the spare tire out from under the
vehicle.
7. Tilt the tire toward the vehicle with
some slack in the cable to access the
tire/wheel retainer.
Tilt the retainer and pull it and the cable
and spring through the center of the
wheel.
8. Put the spare tire near the flat tire.
Removing the Flat Tire and Installing the
Spare Tire
1. Do a safety check before proceeding. See
If a Tire Goes Flat 0 356 for more
information.