Chevrolet 2004 Tahoe Owner's Manual page 477

3. Loosen the cable by turning the wrench
counterclockwise three or four turns.
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.
6. Stand the wheel blocks
on their shortest ends,
with the backs
facing each other.
7. Place the bottom edge of the jack on the wheel
blocks, separating them so that the jack is
balanced securely.
5-99