Abstract: A shift lever and throttle lever coaxially mounted on the casing of an automatic transmission are engaged, respectively, by a lever mounted on each of two concentric shafts whose axes are aligned with the axis of the transmission levers. The shafts have torque sensors located between the levers carried by the shafts and bearings that support the shafts in rotation. The outer shaft has a radial positioning actuator which is hydraulically driven from a source of hydraulic pressure through a servo controlled valve that selectively opens and closes hydraulic passages. The actuator includes a vane fixed to the shaft and a stator that divides a cavity into two halves, each of which is pressurized selectively by operation of the servo.