Chevrolet 1994 Astro Passenger Owner's Manual page 215

Storing The Jack and Spare Tire
Put the tire on the ground at the rear of the vehicle, with the valve stem
pointed down.
Pull the retaining bar through the center of the wheel, making sure it is
properly attached. Attach the ratchet, with the
UP
side facing you, to the
extension.
Put the flat end of the extension on an angle through the hole in the rear
door frame, above the bumper. Turn the ratchet to the right until the tire is
against the underside of the vehicle.
You will hear two"c1icks" when the tire is all the way. Try to move the tire
with your hands to make sure it is securely in place.
Return the jack, ratchet, extension and wheel blocks to the proper location
in the rear storage area. Replace all bolts, retainers and wing nuts in the
proper location. Secure the jacking equipment in its proper location and
replace the jack storage cover.