A ball nut assembly receives rotational motion from a belt and converts rotational motion into linear motion of a steering rack. The ball nut assembly includes a support bearing having an outer race and an inner race, the inner race including one of a spline and a recess. A driven pulley is fixedly coupled to or formed integrally with the inner race. The driven pulley and the inner race rotate in response to movement of the belt. A ball nut includes the other of the spline and the recess, the spline being received in the recess such that rotation of the inner race causes rotation of the ball nut. An elastic material is located in the recess and contacts both the inner race and the ball nut.