Have you considered using dye for the transmission? I know Carquest and Napa carry it. Make sure it is suitable for the transmission. Tray to clean and degrease everything you can underneath and let it dry off then run the car under the proper conditions to make it leak for a short time and then get under there and see where the oil and dye is coming out with a black light. As bad as the leak sounds I would figure you could see it drip off the cooler lines or hoses if that was the case.
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