For the most part I just followed this sticky:I can't help you with your question, but I would like to hear more regarding your cooler install, such as model number, how you installed it, etc. I'm getting a few miles on my truck now and think an ATF cooler might be just the ticket to help extend the AT life.
The cooler model was the same, Hayden 678. I did change how I mounted the unit and also how I ran the return line from the new cooler to the transmission. My mods are included in that thread near the end.