The worm and rotter steering gear (fig. 8-21) is quite similar to the worm and sector, except a roller is supported by ball or roller bearings within the sector mounted on the pitman arm shaft. These bearings assist in reducing sliding friction between the worm and sector. As the steering wheel turns the worm, the roller turns with it, forcing the sector and pitman arm shaft to rotate....

The rack and pinion steering gear system. As the steering wheel is turned, the pinion gear, which is connected to the steering post, rotates, causing the rack, which is geared to it, to move laterally, pushing or pulling the front wheels simultaneously. ...