An auxiliary drive system including a transmission which is connectable to a prime mover and produces an output torque for driving a driveshaft, the transmission having at least first and second power takeoffs, a pump in fluid communication with a hydraulic motor, the hydraulic motor operably connected to the second power takeoff and in fluid communication with the hydraulic pump, a control valve to vary flow rate to the hydraulic motor, the second power takeoff driving a driveshaft operably connected to the transmission.