In more recent automatic transmissions, the valves are controlled by solenoids. These solenoids are Laptop-controlled, With all the gear variety decided by a focused transmission Command unit (TCU) or in some cases this functionality is integrated in to the motor Management unit (ECU). Modern types have replaced the centrifugal governor https://gearboxauto57901.iyublog.com/32941798/helping-the-others-realize-the-advantages-of-gearbox-auto