I have a 05 f150 Fx4 with the tow package. Anyone know what their trans oil temp is when towing or running on the hwy? I installed a temp gauge in line comming out of the trans and it was below 140f. I towed wy trailer up a steep hill and the trans oil pan was just at 150f, I would have thought it would be a little closer to the water temp b/c the oil goes through the radiator before it goes to the ford trans cooler.
Thanks in advance!
It won't be close to the water temp because the trans fluid goes through the side of the radiator that has already been cooled. That side of the radiator is A LOT colder than the engine's thermostat temperature. If it wasn't colder, why have a radiator?
What side did you install the Tempature Probe? Also what size fitting did u use? A buddy of mine has 05 F-150 and he had it supercharged. we wanted to install the Tranny Gauge to keep an eye on the temps.
It would have to be about the same because in liquid-to-liquid cooler the temperatures would end up being close to each other that’s how they work. It would cool the transmission fluid only if it was hotter then the engine coolant. If the coolant were hotter then the trans fluid, then it would heat up the fluid to about the same temperature. When it leaves the radiator it still as to go through the stock FORD air to liquid cooler to pull out more temperature. Granted the coolant going back to the engine is cooler then the coolant going in but I would guess it’s not 50 degrees cooler. (190 down 140) I checked the trans oil pan temperature with an infer red temp gauge, I’ll check the radiator and see what kind of numbers I come up with. It’s my guess that driving in the cold weather I’m driving in is not allowing the temps to increase above 140f but I’ll come summertime I’ll see some big increases in trans temp. (stock cooler works good in cold weather)
By the way, I installed the temperature-sending unit in the line coming from the transmission going to the radiator.
Taking into account gage accuracy, your readings running without a tow load are the same as I get.
When you tow and load the trans long enough, you will see the temp climb.
What you see then is the fluid shear that goes on in the converter.
Back at the pan, the temp will slowly rise and level out over time because the pan gets heated right from the trans and it's running operations as well as the returning fluid.
The radiator will have about a 40° +/- drop accross the top as a normal cooling event.
For your setup depending on what your towing GCW is, expect to see the temp climb to over 200° under heavey towing and hotter temps.
Since the sensor is at the outlet of the converter you will see the temp change quite fast between heavy pulling and light pulling on the road.
A sensor in the pan does not see these kinds of changes nearly as fast and useful.
The range of temps in the trans is much greater than most think, under high loadings.
I've never seen temps over 180 on my truck. Most of the time I'm driving around it's at 150. Occassionally it will go up to 165, but I haven't noticed a difference between towing and normal driving and I lock up overdrive the whole time I'm towing.
Locking up the overdrive means he is towing in 3rd gear. He turns the overdrive or 4th gear off so the transmission doesn't shift into 4th. Your trans temperature will climb very quickly if your constantly shifting between 3rd and 4th gear. Locking out 4th gear will "force" your transmission to shift only thru gears 1-2-3 and keep your torque converter locked.
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