Abstract: An infinitely adjustable seat track assembly is provided with a lower track assembly and an upper track assembly releasably slidable on the lower track assembly. The lower track assembly comprises at least one lower track, and a wrap spring wrapped around a rod and aligned with the lower track. The upper track assembly has at least one upper track which can slide in forward and rearward directions over the lower track. A lever is mounted on the upper track assembly. The lever is pivotable from a latching position where the wrap spring wraps tightly around the rod, to an unlatching position where the lever urges the wrap spring to partially unwrap around the rod, thereby permitting the wrap spring to slide along the rod.