Chevrolet 2004 Astro Owner's Manual page 292

5. Put the flat end of the extension on an angle
through the hole in the rear door frame, above
the bumper. Be sure the flat end connects into the
hoist shaft.
6. Turn the ratchet counterclockwise to lower the
compact spare tire to the ground. Keep turning
the ratchet until the spare tire can be pulled out from
under the vehicle.
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8. Pull the tire out from under the vehicle.
Notice: If you drive away before the spare tire or
secondary latch system cable has been reinstalled,
you could damage your vehicle. Always reinstall
this cable before driving your vehicle.
7. When the tire has been
lowered, tilt the retainer
plate at the end of
the cable and pull it
through the wheel
opening.