GMC 2004 Savana Van Owner's Manual page 328

6. Place the jack under the vehicle, ahead of the rear
bumper. Position the center lift point of the jack
under the center of the spare tire and turn the
handle clockwise to raise the jack until it lifts the
secondary latch spring.
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7. Keep raising the jack until the spare tire stops
moving upward and is held firmly in place, this
lets you know that the secondary latch has
released. The secondary latch has released and
the spare tire is balancing on the jack.
8. Lower the jack by turning the ratchet
counterclockwise. Keep lowering the jack until the
spare tire slides off the jack or is hanging by
the cable.
9. 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.
If the spare tire is hanging from the cable, slide the
ratchet onto the wheel wrench and insert the
wheel wrench into the hoist shaft hole above the
bumper and turn the wheel wrench counterclockwise
to lower the spare the rest of the way. Be sure
the DOWN mark on the ratchet is facing you.