GMC 2009 Sierra - Manual (Page 402)

{ 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 5-116 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 5-116 for the wheel
nut torque specification.
9. 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 the center cap. 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.
5-90