What component is connected directly to the rack to move the steering linkage in a straight line?

The tie rod is the component that is directly connected to the rack in a steering system, and it plays a critical role in translating the movement of the steering wheel into linear motion to the wheels. When a driver turns the steering wheel, the steering rack moves laterally. The tie rods connect to the ends of the rack, allowing this movement to be transferred to the steering linkage, consequently causing the wheels to turn either left or right.

In the context of steering systems, the tie rod's design ensures that it effectively conveys the steering input without introducing play or excessive deflection. This direct connection is vital for maintaining precise steering control and ensuring the vehicle responds accurately to the driver's intentions. The tie rod, therefore, is key in maintaining the alignment and proper functioning of the steering system.

Other components mentioned, like the adjuster plug, pitman arm, and spiral cable, serve different roles in the steering mechanism. The adjuster plug is typically involved in adjustments rather than direct movement. The pitman arm connects the steering gearbox to the tie rods but does not move the steering linkage in a straight line itself. The spiral cable relates to aspects of steering column functionality, particularly in linking controls, but does not play a part in the direct movement of the steering