I bought the ebay alum , 2 row rad, (about $120) added external trans (big!) and oil coolers,
added dual fans,
at 1st thought fans didn't work as never came on, using laser temp gun, showed temps to be under 160,
all the time, so went with 180 stat, car NEVER gets warm, ever!
my personal opinion....... . you can never cool a trans to much! yes, if its 20 below maybe,
but if your on boost alot, as much rad, and trans cooler as you can fit.