GMC Sierra 2008 Owner's Manual page 496

11. Turn the wheel wrench counterclockwise to lower
the vehicle. Lower the jack completely.
CAUTION:
{
Incorrect or improperly tightened wheel
nuts can cause the wheel to come loose and
even come off. This could lead to a crash.
If you have to replace them, be sure to get
new original equipment wheel nuts. Stop
somewhere as soon as you can and have the
nuts tightened with a torque wrench to the
proper torque specification. See Capacities
and Specifications on page 5-129 for wheel
nut torque specification.
Notice: Improperly tightened wheel nuts can
lead to brake pulsation and rotor damage.
To avoid expensive brake repairs, evenly tighten
the wheel nuts in the proper sequence and to
the proper torque specification. See Capacities
and Specifications on page 5-129 for the wheel
nut torque specification.
5-104
12. Tighten the nuts firmly in a crisscross sequence
as shown by turning the wheel wrench clockwise.
When you reinstall the regular wheel and tire, you
must also reinstall either the center cap, or bolt-on
hub cap, depending on what your vehicle is equipped
with. For center caps, place the cap on the wheel
and tap it into place until it seats flush with the wheel.
The cap only goes on one way. Be sure to line up
the tab on the center cap with the indentation on the
wheel. For bolt-on hub caps, align the plastic nut
caps with the wheel nuts and then tighten by hand.
Then use the wheel wrench to tighten.