I was just about to post about how i saw you changed that back. As far as your hose popping off. Have you thought of switching to JIC/AN fittings?Yes that is what I found as well. Since that post I have re introduced the factory in radiator trans cooler. It runs between 165-200 depending on how long the truck has been running. Towing has no effect on temp.
Edit: i see your issue isnwith the threaded portion of the fitting. Ditch the teflon tape, that **** doesnt belong anywhere in a car, especially in a trans where bits of it can clog a valve body.
You need to look for the real issue as to why its leaking. If youve got an oring on that fitting, the oring ONLY is used to seal that fitting. The threads dont seal anything unless its a taper thread.
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