Ok, so I am thinking about adding an external transmission cooler. The 2003 4Runner supposedly comes with a cooler that is internal to the radiator, I do not think I am keen on that idea when I know my radiator temps are hotter than I want my fluid to start with. Anyhow, any prefered manufacturers, and should I only consider coolers with built in bypass, in other words should I worry about my transmission fluid being too cold in the winter? I guess if that is a worry I could rehook it up before winter.