GMC Sierra 2500 HD2022 Owner's Manual page 368

Rear Position
5. If the flat tire is on the rear of the
vehicle, position the jack under the rear
axle between the spring anchor and the
shock absorber bracket.
If a snow plow has been added to the
front of the vehicle, lower the snow
plow fully before raising the vehicle.
Make sure that the jack head is
positioned so that the rear axle is resting
securely between the grooves that are
on the jack head.
Warning
Getting under a vehicle when it is lifted
on a jack is dangerous. If the vehicle slips
off the jack, you could be badly injured
or killed. Never get under a vehicle when
it is supported only by a jack.
Warning
Raising the vehicle with the jack
improperly positioned can damage the
vehicle and even make the vehicle fall. To
help avoid personal injury and vehicle
damage, be sure to fit the jack lift head
into the proper location before raising
the vehicle.
Warning
The jack has a feature to limit its travel
to prevent overextension. When the
height limit is reached, an increase in
resistance if felt when attempting to
raise the jack farther. Raising the jack
past the height limit can damage the jack
pin and cause the jack to lock into an
Warning (Continued)
overextended position or not lower fully.
Do not attempt to force the jack higher
once the height limit is reached.
6. Turn the wheel wrench clockwise to raise
the vehicle. Raise the vehicle far enough
off the ground so there is enough room
for the spare tire to fit under the
wheel well.
7. Remove all the wheel nuts and take off
the flat tire.
(Continued)
Vehicle Care 367