I don't know if I will ever put in a cooler again.

I used to think they were life savers, until 2 cars I put it in, the trans died months after. I came to the conclusion that modern cars cool the trans enough as is. I also have a theory that adding cooling lines for the additional cooler reduces line pressure throughout the system. At 200+ deg, tubing and lines will expand and start changing oil levels along with oil pressure. With the transmissions being the sensitive drama queens that they are, any pressure, volume differences might cause more damage than good with a cooler.

There are guys on ClubLexus that are currently working on hard line cooler systems for the same reasons I am stating. (I don't know why though, as I have very rarely seen a trans fail on that site, I know mine lived a happy life with heavy abuse).

I say don't mess with it.