Good trans cooler to add????
 

My 2008 with 57000 miles is all stock. I live in the Phoenix area so I'm very concerned about transmission cooling. Seems everything I read strongly recommends additional trans cooling. Lowest temps for a very short time is at or around freezing. But highs can be 117 with much hotter temps on street surfaces. Any recommendations on units and placement? By pass factory or in series? Etc. Any advice or help is appreciated. Thanks guys.

Mark L