That part is your speedometer pick up sensor; it has a rubber ring on it. It should only leak when the car is running/ moving. It will not leak when the car is park since its higher then the fluid level in the pan. The transmission vent is right on top; it’s plastic, check it if you think your leak is in that area. If the transmission is over filled the vent will leak. The reaction valve, modulator and servo cover o rings are another common cause of leaks when the car is park for long periods of time, just above the pan. Clean that area well then check it. Also your shift leakage grommet, bushing is bad
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