Getting delayed shift responses, or none at all, from your hydraulic automatic transmission spells trouble. You have to immediately inspect your
valve body, which is your system's control center. It works to select the most efficient gear ratio in your transmission, depending on the available operating conditions in the system and your driving conditions. This mechanism is comprised of a number of spring-loaded valves, servo pistons, and check balls that needs continuous oiling. Of these components, the valves need more than oiling; it uses the hydraulic pressure from the pumped fluid and centrifugal governor to drive different brake band and clutch actuators in the transmission with the help of the throttle modulator and range selector valves. In more modern automobiles, your valve body is assisted with an electronic control unit-the transmission control unit (TCU)-or by the engine control unit (ECU) of the vehicle. Needless to say, this comprehensive setting of this mechanism has to be compromised in any way which is why you are experiencing irregularities when you shift. You can counter this by administering maintenance service to your transmission, or if it is already beyond repair, a replacement would be the best course of action.
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