The automatic transmission has many Transmission components and systems that are meant to work together in a kind of mechanical, hydraulic and electrical technology harmony that has taken years to achieve.
The main components that make up an automatic transmission include:
Planetary Gear Sets: These are the mechanical systems that provide the various forward and reverse gear ratios. Automatic transmissions have gears in multiple combinations.
The Hydraulic System uses a special transmission fluid which is brought under pressure by an Oil Pump via the Valve Body to control the Clutches and the Bands in order to control the planetary gear sets.
Seals and Gaskets: these are meant to keep the oil where it is supposed to be and prevent it from leaking out.
The Torque Converter: this component acts like the clutch to let the vehicle come to a stop in gear with the engine still running. A torque converter is a fluid coupling that is mounted between the engine and the transmission
The Throttle Cable looks at speed and throttle position in order to determine when to shift. The Computer which controls shift points on newer vehicles and directs electrical solenoids to shift oil flow to the appropriate component at the right instant.
The Hydraulic system is a set of passages and tubes that sends transmission fluid to all parts of the transmission and torque converter. Transmission components fluid is essential for various purposes such as shift control, general lubrication and transmission cooling. Every part of a transmission’s functions is dependent on a constant supply of fluid under pressure.

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