GMC 1998 Savana Van Owner's Manual page 225

Removing the Spare Tire and Tools
Your spare tire is stored underneath the rear of your
vehicle. You will use the ratchet and extension to lower
the spare tire.
A flat rear tire reduces clearance to remove the spare
tire. If there is less than 12 inches (30.48 cm) between
the ground and the rear bumper or any trailer hitch, jack
up the vehicle until the flat tire is off the ground. (See
"Removing the Flat Tire" and "Installing the Spare
Tire," Steps 4 through 8, in this section.)
Unless your vehicle has a flat rear tire, do not remove
or restore a tire fromho a storage position under the
vehicle while the vehicle is supported by
a
jack. Always
tighten the tire fully against the underside of the vehicle
when restoring.
If you have a vehicle which was completed from a cab
and chassis, refer to the information from the body
supplierhnstaller.
The spare tire is a full size tire, like the other tires on
your vehicle.
Remove the retaining wing bolt and lift it off the
mounting bracket. Set the jack and jacking equipment
near the flat tire.
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