Most tranny coolers are mounted in front of the radiator.
The fan on the cooler is not a bad idea, Bruiser. Tranny temps need to be stable but usually the factory cooler or the aftermarket coolers do it well. for slow crawling and working the tranny in high temps ( Texas summers) it would probably be a good idea. Is it required or nessacary, probably not. will it give you a safety margin, probably so. I don't know of anyone running a fan on thier tranny cooler. I know Micah has a "Bowtie Built" 700r4 in his K5, but I don't know what kind of cooler he is running. A deep sump (pan) on the tranny will help it run cooler as well.