Abstract: An apparatus for selectively controlling endwise movement of two control members comprising first structure including body structure supporting the members for selective endwise movement thereof; actuator structure coupled to the members for selectively moving the members endwise; and lock structure selectively movable into locking relation with the members to selectively block endwise movement thereof.

Abstract: A transmission control system wherein a selector is movable between multiple positions to control the transmission, there also being brake structure having ON and OFF positions, and a valve unit to control application of pressurized fluid to the brake structure to effect brake movement between the ON and OFF positions, an actuator for the transmission movable between multiple positions corresponding to the selector positions; structure operatively connected with the actuator, the selector and the valve unit toi) cause the valve unit to pass fluid pressure transmission to the brake structure when the selector is in a first position, andii) cause the valve unit to block fluid pressure transmission to the brake structure when the selector is in at least one other of the multiple positions.