I have used a complete air conditioner condenser as a trans cooler on a race car, without using the heat exchanger in the radiator. The cooler was mounted to the roll cage inside the car, rather than in front of the radiator like usual. It worked OK for several seasons with no obvious trans problems.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!