· Premium Member
I assume we are talking about the tranny cooler. AFAIK, all trucks have the same tranny cooler, Big Tow just adds the tranny gauge on the dash. Running the ATF through the heat exchanger in the radiator serves the purpose of bringing the ATF more quickly up to operating temp., particularly in cold climates. Once the coolant in the radiator reaches 180 F (which is I think the temp the thermostat opens), I wonder if the radiator ATF heat exchanger actually does much ATF cooling.