GMC TopKick 2007 Owner's Manual page 327

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.
CAUTION:
{
Rust or dirt on a wheel, or on the parts to
which it is fastened, can make wheel nuts
become loose after a time. The wheel
could come off and cause a crash. When
you change a wheel, remove any rust or
dirt from places where the wheel attaches
to the vehicle. In an emergency, you can
use a cloth or a paper towel to do this;
but be sure to use a scraper or wire brush
later, if you need to, to get all the rust or
dirt off.
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