2018 Expy Platinum Max
475whp on 93
Mishimoto trans cooler
Mishimoto radiator
Tow 8,000# TT regularly through the Smokey mountains
240* is way too hot for both trans & ECT coolant temp. The original factory set up slipped like crazy & you could smell the discs burning. I would have had to go like 50-55 mph & you had to run boost & not rpm’s or else ECT would overheat, by running gearing. Now I can run gearing/rpm’s & not worry about overheating, which keeps the engine load down as well. Since I noticed the high load situation is what creates the trans slipping & bucking.
Your 10R80 will start slipping easily by 235* & higher. Could be simple fix like the internal thermostat control valve, which opens to allow trans fluid to circulate through the the trans mounted heat exchanger—it’s not really a cooler.
That has been known to get stuck, basically, it’s the same as having a stuck thermostat.
I know Ford wants to run these transmissions at higher temps than traditional, but I still think this is just asking for problems & shortens the life of the trans—heat still kills transmissions.
Ford runs a heat exchanger, which circulates engine coolant, through the trans mounted heat exchanger.
This means that the trans temp will never be colder than the engine coolant, so if your engine coolant get hot, like say 230 & higher, then your trans cannot be any colder than the engine coolant temp.
I removed the trans mounted heat exchanger & mounted a Mishimoto trans cooler up front of the new mishimoto radiator & run a 180* stat. Factory is 190.
Trans temps run 150s-160s flat land towing & 175-195 towing mountains, max around 215 after towing up steep grades & then immediately stuck in traffic, so no air moving through the cooler stuck in traffic, it will warm up a bit from heavy work up the mountain & then immediately cool off once you get moving again.
ECTs run low 190s up to 210 while towing up hill,
& around 215 doing WOT 1/4 mile pulls
Stinks Ford doesn’t build it right, to begin with, so I would either had to get rid of it, or fix it right. So, decided to fix it, since I’ll have it a few more years.