GMC 2009 Savana Van Owner's Manual page 334

2. Turn the hoist extension counterclockwise until
approximately 6 inches (15 cm) of cable is
exposed.
3. Attach the jack handle/jack handle extension and
wheel wrench to the jack.
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4. 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.