Abstract: A shaft assembly includes a first shaft, a second shaft and a constant-velocity joint secured to the second shaft. The constant-velocity joint includes an outer can secured to the second shaft and an inner race located at least partially in an outer can pocket. The first shaft is coupled to the inner race. The shaft assembly further includes a seal assembly including an outer boot having an outer boot first end secured to the first shaft and an outer boot second end secured to the outer can.

Abstract: A synchronizer for motor vehicle driveline components such as transmissions and transfer cases includes a pair of ball ramp mechanisms which amplify synchronizing force and apply such force to one of a pair of friction clutch packs which achieves synchronization of diversely rotating elements. The synchronizer exhibits relatively low operating force. Each ball ramp mechanism includes a pair of ball ramp members having rotational travel limits which also limit their axial separation and an intermediate compression spring assembly. The spring assembly and the travel limits of the ball ramp members limit the force generated by the ball ramp mechanisms and applied to the friction clutch packs to prevent abrupt and uncontrolled actuation of the friction clutch packs and corresponding abrupt synchronization of the rotating elements.