GMC Yukon Denali 2003 Owner's Manual page 371

Front Position
Front Tire Flat: If the flat tire is on a front tire of
the vehicle, you'll need to use the jack handle (C)
and only one jack handle extension (D). Attach
the wheel wrench to the jack handle extension.
Attach the jack handle to the jack. Position the jack
on the frame behind the flat tire where the frame
sections overlap. 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 clear the ground.
Rear Position
Attach the wheel wrench to the jack handle
extensions. Attach the jack handle to the jack. Use
the jacking pad provided on the rear axle. 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 clear
the ground.
Rear Tire Flat: If the flat
tire is on a rear tire of the
vehicle, you'll need to
use the jack handle (C)
and both jack handle
extensions (D).
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