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Introduction: The steering gearbox is a unit that can be found on most of the larger duty trucks and older cars. Gearboxes are used in cases where the weight of the vehicle would be too much for a rack and pinion to handle.
The pinion gear is attached to the steering shaft. When you turn the steering wheel, the gear spins, moving the rack. The tie rod at each end of the rack connects to the steering arm on the spindle (see diagram above). The rack-and-pinion gearset does two things: It converts the rotational motion of the steering wheel into the linear motion needed to turn the wheels.