Hunter of Trolls
Join Date: Nov 2012
Location: east coast
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trans oil operates best at 170*.. there is an internal thermostaticaly controlled vlave that opens at 165* and sips cooler oil, in attempt to keep it around that temperature.. of course, when you work it by towing or hauling, you're going to go over that- and at what point that valve stays open and you bring the full force of the heat exchanges into the mix.. if it is circulating @ 100%, and you're above 220* on that transmission oil, you've got a problem somewhere causing it..
running an external filter and heat exchange for the coolant is a good notion.. aim for a temperature within 10* above the thermostats rating.. I don't want to sound like a prick, but the factors that determine your operational temperature are these, and these alone : volume of coolant, size and design of exchange surface, flow of air through the exchange, flow of fluids through the closed system, and thermostats.. you adding a small heat exchange, even fan driven, isn't going to do a whole lot to cooling the coolant... a plate style exchange (not a tube and fin) will cool the most as it reduces the volume and flow long enough for some cooling to actually take place- but to install it into a system like what we have, it would have to be a big one because of issues with pressures and possibly creating an obstruction... all that said: if you want to lever that cooler for it's best function, turn it on a few degrees before the rated 'stat's temperature.. so you can get a little bit of a head start on it.. but, don't expect it to account for much reduction when you're under load..
I'm watching this thread, and I appreciate you posting it up.. I've had great success with electric fans in the past, and will consider them on this rig, too.. as in, discard clutch fans and go all electric. there is a controller out there called a Dakota, that can be programmed to operate several different channels for either stacking two (or even three) fans on one exchange that each fire up at different temps, or you can operate different fans for different exchanges as yo see fit.. I'd love to have a 7kCFM rigged as a pusher on the front of the truck that can be toggled on either by upfitter or automatically, which woulds keep the coolant around 190~195 no matter the situation..
oh, one more thing, fwiw: all those temperatures are related.. the trans oil exchanges through the radiator which is controlled by the engines stat(s).. the oil is cooled via coolant charged oil cooler, which is related to the coolants ability to exchange heat... if you can control your coolants temperature under any circumstance related to engine load, and at around the stat's rated temperature, and via a boss of an electric fan (I'm thinking 5kCFM at a minimum, w/ 7kCFM being optimum) ALL of these fluid temperatures will be a mitigated and managed concern, and all you'll have to worry about is filters..