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I do have an external tranny cooler from the factory. It comes with the class 3 towing package along with the oil cooler. I just think that in this hot climate, tranny fluid passing through the radiator will get heated up too much after the engine gets hot. What I'm seeing here in Phoenix is when I get stuck in a traffic jam, and the temps are in the 100s, the tranny fluid really gets hot.(I have a tranny temp. gauge on the A-pillar) So I'm also putting a small 6'' e-fan on the tranny cooler for towing purposes. The bypass valve will allow me to switch back normal when I'm in colder climates like the high country.
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