Part of a rack-and-pinion steering system, the rack is a bar parallel to the front axle that moves left or right when the steering wheel is turned, aiming the front wheels in the correct direction.

The RWS system is particularly beneficial for heavier vehicles with long wheelbases, such as trucks, SUVs, and EVs.

The steering gearbox contains the gears that transmit the driver’s steering inputs to the steering linkage that turns the wheels, and it multiplies the driver’s steering changes so that the ...