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What about just using a factory 64 65 66 imperial trans cooler?
Fair weather cars just use cooler out front. That way when it leaks it pours on ground not into cooling system and vice versa.
I always change the fittings on the trans to the female side of inverted flare to eliminate the twisty lines when open end wrench slips on the brass fitting.
The trans cooler inside a radiator is not very large, and is still the temperature of the coolant. An external one will truly "cool" your transmission.
I used one on my '93 B250 Van when I pulled my trailer. I bought the type that mounts to the front of the radiator. Worked well and did the job. (However, I still used the radiator one too; no need not to. So my van had two coolers on it.)