Could anyone give me some advice as to what would be involved in installing a transmission cooler and what type should I get
It's a 2001 Ford Tarus w/ Vulcan

all you need is the cooler kit and a few small hose clamps. I would suggest one rated to a 50000 lb GVW. Block and fin style are the best, but if you don't tow (which you shouldn't be with a vulcan), a bar-and-fin style is fine too.