aux filter-cooler
The flatbed on my M1031 has plenty of room under it to work with. I deleted the stock in radiator cooler and ran hard lines-3/8 brake line, back under the bed. You can use this cooler with the stock rad cooler, but that cooler is always the same or at a slightly lower temp as the engine. Mine takes cooler ambient air to cool the oil. The fan driven cooler is a Derale electra cool 16 pass, that means the tubes pass 16 times within the cooler. The part# is 15900. $181.99 at Jegs. Pricy but so is a rebuilt trans. I did not hook up the thermostat, It's ign on, fan on. As far as the filter goes, you can allways spin a new one on every other oil change and change the pan filter accordingly. Over kill? Yea, but the trans only runs about 120 deg even on the hottist days. If you plan on dragging heavy firewood or a trailer, this is the way to go.