Adding a transmission cooler

What I heard was to pre-cool it then run it through the radiator cooler to stabilize running temperature then back to radiator.
I have always ran it thru the rad. and then thru the front mounted cooler, it keeps it cooler going back to the trans. The fluid will be rad. temp after warm up, before going in the cooler. I also ran w/ just the cooler on a hemi racecar too.