[iwillnc]

Although I'm in this same dumb boat "**** aint happened in the last 10 years of its life but now that I'm concerned about it, it will definitely happen anytime in the next hour drive" state-of-mind as you are, I'm fairly certain that stock cooler is more than efficient unless you do Moab every week.

The part that goes into the radiator is kinda like a thermostat, in the winter it helps warm up the fluid before it enters the trans. In all honesty I can't see how you wouldn't be fine with just the stock minus coolant radiator bypass.

I have the exact radiator kit as the author sitting in my garage, but the more I think about it the worse it sounds to install.

Proper transmission temps are between 160-190.
This is also the temp the computer expects the transmission to run at, else it will keep cycling the transmission as if it is cold to protect it.