What is causing my 2016 Dodge Ram 1500 to leak transmission fluid under the radiator? Sometimes it leaks enough to puddle up on the ground.​​​​​

 

Leaking cooler, or line. Gonna have to crawl under there, and see where it's coming from.

 

Cooling line or fitting. Check inside to make sure there isn't any pink foam. That would mean water getting into the transmission. I would assume either you had a small rock hit the line and cause a pinhole or the fitting is getting loose.