Patent ID: 8047323

Claim:
A vehicle comprising: a primary driveline having a first differential that is configured to distribute power to a first set of vehicle wheels; a power take-off unit (PTU) having a PTU input, a PTU output and a synchronizer for selectively de-coupling the PTU output from the PTU input; and a secondary driveline that is configured to distribute power to a second set of vehicle wheels, the secondary driveline having a propshaft, a second differential, a pair of half-shafts and at least one torque transfer device, the propshaft transmitting rotary power between the PTU output and an input of the second differential, the half-shafts being rotatably coupled to an output of the second differential and configured to transmit rotary power to the second set of vehicle wheels, the at least one torque transfer device being configured to selectively inhibit torque transmission through the second differential to the second set of vehicle wheels; wherein synchronizer includes an axially shiftable member that is movable between a first position, in which the PTU input is not coupled for rotation with an intermediate gear, and a second position in which the PTU input is coupled for rotation with the intermediate gear to thereby transmit drive torque between the PTU input and the PTU output.