GMC 1999 Suburban, Owner'S Manual, Page: 278 / 424

yellow blue
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For four
-
door utility models equipped with an
underbody spare tire carrier, follow these instructions to
restore a spare or flat tire:
1. Lay the tire on the ground at the rear of the vehicle.
Position the tire so that the valve stem is pointed
down and to the rear of the vehicle.
2. Tilt the retainer downward and through the wheel
opening. Make sure that the retainer is fully seated
across the underside of the wheel.
3. Attach the ratchet, with the UP mark facing you,
near the hook at the end of the jack handle. Insert the
other end, on an angle, through the hole in the rear
bumper and into the hoist shaft.
4. Raise the tire fully against the underside of the
vehicle. Continue turning the ratchet until there are
two “clicks” or “ratchets.” The spare tire hoist
cannot be over
-
tightened.
5. Grasp and push against the tire to be sure it is stored
securely and does not move.
If You’re Stuck: In Sand, Mud,
Ice or Snow
In order to free your vehicle when it is stuck, you will
need to spin the wheels, but you don’t want to spin your
wheels too fast. The method known as “rocking” can
help you get out when you’re stuck, but you must
use caution.
CAUTION:
If you let your tires spin at high speed, they can
explode, and you or others could be injured. And,
the transmission or other parts of the vehicle can
overheat. That could cause an engine
compartment fire or other damage. When you’re
stuck, spin the wheels as little as possible. Don’t
spin the wheels above 35 mph (55 km/h) as shown
on the speedometer.