Four wheel drive

Claim 1

A DRIVE UNIT FOR USE WITH A PRIME MOVER COMPRISING IN COMBINATION, (1) A HOUSING, (2) A THROUGH SHAFT EXTENDING INWARDLY FROM THE FORWARD END OF SAID HOUSING AND OUTWARDLY FROM THE REARWARD END OF SAID HOUSING AND BEING MOUNTED IN SAID HOUSING FOR ROTATION ABOUT ITS AXIS AND TRANSMITTING TORQUE FROM THE PRIME MOVER, (3) A FIRST AND A SECOND DRIVE SHAFT MOUNTED IN SAID HOUSING IN A SPACED RELATIONSHIP WITH EACH OTHER AND SAID THROUGH SHAFT FOR ROTATION IN OPPOSITE DIRECTIONS ABOUT SEPARATE AXES SPACED FROM SAID THROUGH SHAFT AXIS AND BEING OPERATIVE TO INDEPENDENTLY AND SIMULTANEOUSLY TRANSMIT TORQUE, (4) AND MEANS OPERATIVE TO TRANSMIT TORQUE TO SAID DRIVE SHAFTS INCLUDING AT LEAST A DIFFERENTIAL UNIT COMPRISING A GEAR CARRIER, COMPENSATING GEARING CARRIED BY SAID CARRIER, AND A PAIR OF OPPOSED SIDE GEARS, (5) SAID GEAR CARRIER AND SAID SIDE GEARS BEING DISPOSED IN SAID HOUSING FOR CO-AXIAL ROTATION ABOUT SAID THROUGH SHAFT, (6) MEANS FOR CONNECTING ONE OF SAID SIDE GEARS FOR UNITARY ROTATION WITH SAID THROUGH SHAFT, (7) MEANS DRIVINGLY CONNECTING THE OTHER OF SAID SIDE GEARS TO ONE OF SAID DRIVE SHAFTS, (8) AND MEANS DRIVINGLY CONNECTING SAID COMPENSATING GEAR CARRIER TO THE OTHER OF SAID DRIVE SHAFTS, (9) WHEREBY SAID DIFFERENTIAL GEAR UNIT IS OPERATIVE TO TRANSMIT TORQUE TO SAID DRIVE SHAFTS FROM SAID PRIME MOVER INDEPENDENTLY, SIMULTANEOUSLY, DIFFERENTIALLY, AND IN OPPOSITE DIRECTIONS.