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Old 09-20-2021, 04:39 PM   #1
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F150 with eco boost

Question for my son, he has a 2021 f 150 with tow package. trailer 7500lbs. his question is this, while towing what kind a=of tranny temps should he be looking at?
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Old 09-20-2021, 05:10 PM   #2
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Does it have a different transmission than the 10 speed Ford’s been using in the F-150 & Expedition for the last few years? I see up to about 210 under normal driving. While towing I see sustained temps up to about 225 and peaks of up to 235. Yes, it is a lot warmer than older transmissions, but it also uses a new transmission fluid designed for those higher temperatures.
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Old 09-20-2021, 06:52 PM   #3
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You won't have any trasmission issues with that load. The truck is certified according to SAE J2807 standards to tow almost twice that without the transmission overheating.
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Old 09-21-2021, 10:35 AM   #4
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I tow a smaller TH--180RT--that weighs in just about 4400# with the motorcycle in the garage. My '18 F150 SCab has the 3.5EB and Max Tow option. 10spd tranny runs about 208-212* towing at 65 MPH. Temps of 225-235* shouldn't be a problem with the new fluids these days. Lubrication has improved dramatically in both engine and trans oils. I would worry if I saw sustained temps of >255* and would prompt a fluid flush and change.

Even with a light trailer, I do find that locking out both 10th and 9th gear makes for less shifting up and down grades, and likely reduces trans temps.
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Old 09-21-2021, 03:48 PM   #5
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Never had a problem with my '16's tranny but the 3.5 Ecoboost would overheat on a big grade with our 8000 lb trailer. I would have to slow down to 45.
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Old 09-21-2021, 08:20 PM   #6
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Quote:
Originally Posted by outbackmac View Post
Question for my son, he has a 2021 f 150 with tow package. trailer 7500lbs. his question is this, while towing what kind a=of tranny temps should he be looking at?
I towed my 8200lb toyhauler with my 2016 2.7EB F-150 6 speed & 3:55 gears.
Engine temp ran as hot as 220 / tranny temp ran as hot as 212 on 100 degree Texas summer days. They usually ran cooler than that though... more like engine 206 / tranny 200.
I can't speak for my 2018 3.5EB F-150 as it's my toad not the tower but the tranny temp floats between 198 - 208 once warmed up.
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Old 09-23-2021, 04:49 AM   #7
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I am thinking the 2.7 Eco-Boost has a fancy engine block like Compacted Graphite Cast Iron (CGI). I think that material disperses heat better than the more common Gray Cast Iron engine block.
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