Don't remember for sure but seems to me that, on another forum that had a transmission engineer, he stated that 60-90 degrees above ambient. The temp could vary according to the amount of work being done. In my case I have an additional cooler and am now running about 140-150 degrees, without towing, with ambient being in the 80's.
When towing in the mountains of Utah last year, with ambient 90's, I saw 190's and one time on long steep grade I went to 205 very briefly. All of that is while moving. Start and stop traffic can make it go slightly higher. Hope this gives you some sort of info that is helpful.
Good luck, safe travels and happy camping!
02 F250 7.3 Auto CC LB Brakesmart Reese Straightline
98 Sunnybrook 29DBS
i've got similar readings with my 08 2500 D/A. Usually runs 170's to 190's when towing, but have seen as high as 205-208 when pulling hills in 100 degree weather going 60-63 mph.
Transmission fluid temperature vs. fluid life chart.
Note that time-at temperature is an important factor...a very short time at high temperature does little damage to the fluid, while longer time at high temperature kills the fluid. One needs to know the location of the sensor in the transmission. If it is on the way to the cooler, that fluid isn't hot for long. If the sensor is in the sump or the return from the cooler, high temperatures are a very serious matter.
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Transmission fluid temperature vs. fluid life chart.
Note that time-at-temperature is an important factor...a very short time at high temperature does little damage to the fluid, while longer time at high temperature kills the fluid. One needs to know the location of the sensor in the transmission. If it is on the way to the cooler, that fluid isn't hot for long. If the sensor is in the sump or the return from the cooler, high temperatures are a very serious matter.
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