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A cooler is a good idea because it lowers the temperature of the transmission oil that tends to be heated more my the greater load resulting from towing a trailer. Set it up so that fluid goes through the cooler on the radiator first, then goes into the add-on cooler, then from the add-on cooler through the return line back to the transmission. What this means is that you connect one of the hoses to the add-on cooler to the nipple on the radiator (source of transmission fluid) and the other hose to the return line that use to connect to the top fitting on the radiator.
Mike
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