GMC Chevrolet Tahoe 2003 Manual page 472

4. Repeat this procedure at least two times. If the
spare tire lowers to the ground, continue with
Step 5 of "Removing the Spare Tire and Tools"
earlier in this section.
5. Turn the wrench counterclockwise until
approximately six inches (15 cm) of cable is
exposed.
7. Place the bottom edge of the jack on the wheel
blocks, separating them so that the jack is
balanced securely.
5-96
6. Stand the wheel blocks
on their shortest ends,
with the backs
facing each other.