Inner Tie Rod (Axial Joint)

It has a ball joint inside a rubber boot. It is often replaced with the outer end. It can wear with age. A torn rack boot lets dirt and water reach the inner joint and shortens its life, so boots should be checked and replaced when damaged. Special tools help remove the joint from the rack. The tie rod length sets the toe, so counting turns when replacing helps keep alignment close before the final adjustment.

The joint allows the wheel to move while steering.

Wear causes clunks and play. Alignment is needed after replacement.