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The Trans-Go solenoid works with this little collection of solenoids and pressure switches. The two far left units are the 1-2 and 3-4 gear shifters; the two bottom units are the 3-2 gear solenoids, pulse-width modulated, to improve the 3-2 downshift. The solenoid also regulates the release of the 3-4 clutch and the 2-3 band apply. The black plate is the transmission fluid temperature sensor, which helps control the torque-converter clutch apply and shift quality.