 Due to the rear-mounted engine, the differential lies between the transmission and engine, so drive to the transmission from the engine is carried forward via a hollow turbine shaft from the engine mounted torque converter to the transmission gearbox.Power from the gearbox was carried rearward again to the differential pinion gear via yet another, concentric hollow shaft of larger diameter.A small concentric shaft inside the turbine shaft operated the front pump of the transmission to permit engagement of drive/reverse ranges when the car was stopped or moving slowly; at speeds over , a differential-driven (from the car motion) rear pump of smaller capacity and greater efficiency took over and the front pump shut down to improve fuel economy.