GMC 2008 Envoy Denali Owner's Manual page 388

7. Turn the wrench clockwise to raise the jack until it
lifts the end fitting.
8. Continue raising the jack until the spare tire stops
moving upward and is held firmly in place. The
secondary latch has released and the spare tire is
balancing on the jack.
9. Lower the jack by turning the wheel wrench
counterclockwise. Keep lowering the jack until the
spare tire slides off the jack or is hanging by
the cable.
10. Disconnect the jack handle from the jack and
carefully remove the jack. Use one hand to push
against the spare while firmly pulling the jack out
from under the spare tire with the other hand.
5-94
12. Be sure that the socket end of the extension
connects to the hoist shaft.
11. If the spare tire is
hanging from the
cable, insert the socket
end of the extension
into the hoist shaft hole
on a 45 degree
angle downward.