Also going to plan on Bypassing the radiator all together. some of the driving I do is mountains, and on 38s, I dont think I have to worry about the trans getting up to operating temperature.
The TOP line in the radiator is the return correct. also...if I mount the cooler on its side, does it matter which which I send the fluid in?
I had a 70268 and it seemed to work fine but now it doesn't fit in front of my radiator so I have a crappy tube and fin style behind my bumper with a bunch of holes drilled in it.
run the thinner one if you want an easy install. i mistakenly bought the thicker one and it was a PITA to install in front of the condenser, which i have since then thrown out.