Steering consists of a steering wheel, steering column, steering box, tie rods, kingpins, drag link, pitman arm, power steering fluid reservoir, pump and power steering lines and hoses. Suspension consists of springs, bushings, airbags and shocks. If there is too much play in your steering components it will cause a shake in your steering wheel, versus if you feel it in the whole truck or the seat it is caused by your driveline, tires, or springs.