GMC 1999 Suburban Owner's Manual page 263

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On four door utility models, the spare tire may be stored
under the vehicle in an underbody carrier.
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4 Door Utility Models
A. Hoist Assembly
B. Hoist Shaft
C. Ratchet
D. Jack Handle
E. Retainer
F. Valve Stem, Pointed
Down
G. Spare Tire
Follow these instructions to lower the spare tire:
1. One side of the ratchet has an UP marking. The other
side has a DOWN marking. Assemble the ratchet to
the hook near the end of the jack handle (as
illustrated) with the DOWN marking facing you.
Insert the other end through the hole in the rear
bumper and into the hoist shaft.
2. Turn the ratchet to lower the spare tire to the ground.
Continue to turn the ratchet until the spare tire can be
pulled out from under the vehicle.
3. When the tire has been lowered, tilt the retainer at
the end of the cable so it can be pulled up through
the wheel opening.
4. Put the spare tire near the flat tire.
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