Transmission cooler lines leaking

[Chamberpains]

That's is a horrible idea to add another cooler and more lines that will potentially leak and take abuse. The KISS (keep it simple stupid) method works great. Most if us that dealt with trans coolant heat exchangers simply went to an air cooled cooler that hangs off the back of the trans or mounts somewhere up out of the way from road debris. My transmission gets to 180°f at its hottest. Most of the time it never moves the temp guage.

If your trans is running under 230-240°f then it's doing its job. If it's getting up to 250°+ then there is either a problem with the cooler or the trans or the pump in the trans. Fix it. I don't know of a hauling scenario that would require anything more then a well placed single cooler. If your just a standard freight hauler then the simpler the better will do just fine for all scenarios.