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Old 03-08-2022, 06:38 PM   #41
Wyldfire
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After market transmission cooler doesn't do any good with 2017+ Ford transmissions. They have a thermostat in them that doesn't open till 220 or so. They are designed to run hotter than most people are comfortable with. Normal operating temp is 220-250. Ford has found increasing temp increases efficiency. Fords new synthetic transmission oil can take the heat. Long video of why hot to most people isn't "hot" to Ford.

https://youtu.be/C0iKcag-wr8
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Old 03-08-2022, 09:28 PM   #42
Falcon67
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Pulling 13k or so, I never saw the 2020 7.3L 10 speed ever get past 220 in full summer Texas heat. The pavement around 130F type heat.
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Old 03-08-2022, 09:32 PM   #43
Wyldfire
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Come out west in the dry mountains. I can see 230 to 240 all the time in the summer climbing passes, first trip worried me coming from a 90's Dodge Cummings. Noticed the fan wasn't coming on. Little research and guages showed it was normal range.
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Old 03-09-2022, 06:03 AM   #44
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We moved daughter and family to Albuquerque in August last year. I noticed tthat the F-350 got better mileage in NM and did not have any change in trans temp in the higher elevation. I did not look at a specific temp coming up out of Albuquerque but nothing special about the gauge reading. We went in at 20K+ and came out at 16K+ GCVW. 1026 miles, average 7.9 MPG. 7ish in Texas, around 8 in NM. Just the truck running alone was getting 15 in NM. Averaged 12~12.5 around here. Truck weighed 7510 with two of us and a full fuel load (48 gallons).
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