Chevrolet 2009 Express Owner's Manual page 332

10. Lower the vehicle by turning the jack handle
counterclockwise. Lower the jack completely.
CAUTION:
{
Wheel nuts that are not tight can work loose. If all
the nuts on a wheel come off, the wheel can come
off the vehicle, causing a crash. All wheel nuts
must be properly tightened. Follow the rules in this
section to be sure they are.
5-92
CAUTION:
{
If wheel studs are damaged, they can break. If all
the studs on a wheel broke, the wheel could come
off and cause a crash. If any stud is damaged
because of a loose-running wheel, it could be that
all of the studs are damaged. To be sure, replace all
studs on the wheel. If the stud holes in a wheel
have become larger, the wheel could collapse in
operation. Replace any wheel if its stud holes have
become larger or distorted in any way. Inspect hubs
and hub-piloted wheels for damage. Because of
loose running wheels, piloting pad damage may
occur and require replacement of the entire hub, for
proper centering of the wheels. When replacing
studs, hubs, wheel nuts or wheels, be sure to use
GM original equipment parts.