Chevrolet 1993 Astro Passenger Owner's Manual page 223

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K3524
Remove the wheel blocks and jack by turning the wing nut counterclockwise.
Remove the wing nut and washer then pull the wheel blocks and jack off the
bolt.
To remove the ratchet and extension by turning the wing nut
counterclockwise. Remove the wing nut and retainer and take out
the ratchet and extension.
Spare Tire
K3526
Your spare tire is stored underneath your vehicle. You will use the ratchet
and extension to lower the spare tire.
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