GMC Sierra Classic 2007 Owner's Manual page 566

4. Turn the wheel wrench (H) 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.
If the spare tire does not lower to the ground,
the secondary latch is engaged causing
the tire not to lower. See Secondary Latch
System on page 576.
566
5. Use the wheel
wrench hook which
allows you to
pull the hoist cable
towards you to
assist in reaching
the spare tire.
7. Put the spare tire near the flat tire.
6. Tilt the retainer at
the end of the cable
when the tire has
been lowered,
so it can be pulled
up through the
wheel opening.