This particular system is known as after the type of gears that are used. A small pinion gear, linked to the steering wheel, meshes with an extended rack gear, linked at both ends to the tie rods and steering knuckles. When the driver turns the tyre, it pushes the rack still left or right, thereby turning the Rack Pinion Steering wheels left or right.
A FRESH Rack and Pinion In a car Restoration ProjectFor decades, the typical power-steering system has been hydraulically assisted. A hydraulic pump, the power-steering pump, uses engine capacity to generate hydraulic pressure, which is definitely fed through the energy steering hoses to the rack. When steering is usually used, hydraulic pressure improves the driver’s input force, making for simpler steering.
Rack-and-pinion steering is somewhat different from the steering boxes we looked at in last month’s issue. Perhaps the best way to describe it is that it combines the steering container and tie rod, or centerlink, into one unit. In addition, it mounts up front, across the car, either behind the axle centerline or before it. This is why you’ll hear steering racks referred to as frontsteer and rear-steer racks. Attach a rear-steer unit in front of the axle centerline and the tires will go left when you steer correct, in exactly the same manner some steering boxes need to have their internals reversed to work in certain situations.
The tyre, through the steering column, is directly connected to the rack, though it may also employ universal joints, a rag joint, or a sliding joint. In the rack is usually a pinion assembly that in turn techniques a toothed piston, which operates the steering gear. The tie rods are connected to each end of the piston.
The benefit of rack-and-pinion steering is that it is more precise than a steering box. There are fewer shifting parts, making the steering more responsive. Of course, as with boxes, there will be the choices of manual or power steering. It’s also very easy to screw up your frontend geometry when adding a steering rack to an existing frontend, leading to bumpsteer, though of 
course this will be removed in the event that you opt for one of the many rack-and-pinion retrofit kits we’ll go into shortly.
The steering equipment transfers Rack and Pinionthe rotary motion of the tyre to a linear motion used to steer leading wheels. Two types of steering equipment are used today, the typical gear box and the rack and pinion. The typical gear box runs on the worm gear that’s rotated by the tyre to move the pitman shaft. The worm gear includes spiral cut grooves that mesh with a sector equipment at the top of the pitman shaft. The spiral actions of the worm equipment causes the pitman shaft to move the steering linkage in a linear movement. Power steering is attained by using hydraulic pressure to assist in the rotation of the worm gear.