GMC 2007 Yukon XL Owner's Manual page 515

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.
Rear Position – 1500 Models
515