Chevrolet 2008 Express Owner's Manual page 330

To access the equipment, remove the retaining wing
bolt and lift it out of the mounting bracket.
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The tools you will be using include the jack (A), jack
handle extension (B), jack handle (C), wheel wrench (D),
and the ratchet (E).
The spare tire is stored underneath the rear of your
vehicle. You will use the wheel wrench (D) and
the ratchet (E) to lower the spare tire from the vehicle.