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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.
Recirculating-ball Steering. Recirculating-ball steering is used on many trucks and SUVs today. The linkage that turns the wheels is slightly different than on a rack-and-pinion system. The recirculating-ball steering gear contains a worm gear. You can image the gear in two parts. The first part is a block of metal with a threaded hole in it.