Chevrolet 2008 Avalanche Owner's Manual page 456

Make sure the retainer is fully seated across the
underside of the wheel.
3. Assemble the two jack handle extensions (I) and
wheel wrench (H) as shown.
5-96
5. Raise the tire part way upward. Make sure the
retainer is seated in the wheel opening.
6. Raise the tire fully against the underside of the
vehicle by turning the wheel wrench clockwise
until you hear two clicks or feel it skip twice.
You cannot overtighten the cable.
4. Insert the open end
of the extension (F)
through the hole in the
rear bumper (G) (hoist
shaft access hole).