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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 rack and pinion helm includes a pinion gear fitted directly on the steering shaft that engages a rack gear in a tubular housing. Rack steering is the most efficient mechanical system for moving the cable, but its drawback is its width.