GMC 2010 Yukon XL Denali Owner's Manual page 478

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