Tie Rod End
The outer end of the tie rod containing a pivot joint that connects the steering system to the wheel knuckle.
A tie rod end is the vital pivoting link at the outer end of a vehicle's steering linkage. It connects the inner tie rod (which attaches to the steering rack or steering gear) to the steering knuckle on the wheel hub assembly, transmitting steering input to turn the wheels.
The tie rod end contains a precision ball-and-socket joint housed in a greased metal casing and protected by a flexible rubber dust boot. This design allows the steering linkage to pivot left and right to steer the vehicle while simultaneously pivotting up and down as the suspension travels over bumps.
Over time and miles, the ball joint inside the tie rod end wears down, creating mechanical play. Symptoms of a failing tie rod end include a loose or shaking steering wheel, a front-end alignment that wanders, uneven tire wear, and clunking or squeaking noises when turning or driving over rough surfaces.
A worn tie rod end is a severe safety hazard; if the ball-and-socket joint separates completely, the wheel will steer independently of the steering system, leading to a complete loss of control. Replacing worn ends and performing a wheel alignment is critical.