2003 GMC Sierra 1500 Pickup Owner's Manual - Page 451

II II W After the tires have been rotated, adjust the front and rear inflation pressures as shown on the Certificationnire label. Make certain that all wheel nuts are properly tightened. See "Wheel Nut Torque" under Capacities and Specifications on page 5-120. If your vehicle has dual rear wheelsand the tread design for the front tires is different from the dual rear tires, always use the correct rotation pattern shown here when rotating your tires.The dual tires are rotated as a pair, and the inside rear tires became the outside rear tires. When you install dual wheels, be sure the vent holes in the inner and outer wheels each side are lined up. on 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 an accident. When you change a wheel, remove any rust or dirt from places where thewheel 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 brushlater, if you need to, to get all the rust or dirtoff. See "Changing a Flat Tire" in the Index. 5-76