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Old 03-30-2012, 11:13 PM   #1
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F150 Ecoboost tranny temp

I've been driving the new ecoboost trying to get some break-in mileage before I do any pulling. I have a question to the ecoboost owners with max tow, what is your tranny temp when cruising down the highway with no trailer?
Mine runs about 90-95C at 110km/h which seems way too high for me. I have 1100 kms on the truck now. For comparisons sake, my suburban in the same scenario is at 45-50C. Both have factory tranny coolers.
Thanks in advance.
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Old 04-03-2012, 01:30 PM   #2
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Mine runs in the 190-195F range whether I'm towing or not. I've been told that this is the normal range on these new trannys.
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Old 04-03-2012, 01:35 PM   #3
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Just as an example my 2500 Chevy Gasser never excedes 200 while towing
175 degrees if I use fan.
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Old 04-03-2012, 09:11 PM   #4
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I believe if you get under the truck and follow the transmission lines you will find that there is a thermostat unit in the lines. This allows the fluid to come up to temp faster and maintain that temperature. Better fuel mileage and shifting in cold weather.
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Old 04-03-2012, 09:18 PM   #5
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Originally Posted by rgmiller32 View Post
I believe if you get under the truck and follow the transmission lines you will find that there is a thermostat unit in the lines. This allows the fluid to come up to temp faster and maintain that temperature. Better fuel mileage and shifting in cold weather.
that would make sense ! but I would think no matter what you would always want is as cool as possible but hey maybe ford thinks they again have a better idea I bet not !
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Old 04-03-2012, 09:31 PM   #6
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Mine runs in the 190-195F range whether I'm towing or not. I've been told that this is the normal range on these new trannys.
Wow thats smoken hot
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Old 04-03-2012, 09:40 PM   #7
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Wow thats smoken hot
yep, the times they are a'changin.
The fluid is different too.
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Old 04-04-2012, 07:28 PM   #8
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Originally Posted by rgmiller32 View Post
I believe if you get under the truck and follow the transmission lines you will find that there is a thermostat unit in the lines. This allows the fluid to come up to temp faster and maintain that temperature. Better fuel mileage and shifting in cold weather.
Yes, The transmission thermostat keeps the fluid around 200 degrees, This allows the fluid to flow to all the little needle bearings and bushings through the tiny passages transmissions have in them, keeping the fluid too cold is just as bad as too hot in cold climates, The fluid simply cannot reach the bushings quick enough to properly lube them when it is too thick, that is another reason for the synthetic fluid.
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Old 04-04-2012, 07:32 PM   #9
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Yes, The transmission thermostat keeps the fluid around 200 degrees, This allows the fluid to flow to all the little needle bearings and bushings through the tiny passages transmissions have in them, keeping the fluid too cold is just as bad as too hot in cold climates, The fluid simply cannot reach the bushings quick enough to properly lube them when it is too thick, that is another reason for the synthetic fluid.
even with the thermostat the fluid is still roughly the same as the outside temp and if its -20 f so is the fluid !
so for at least 15 minutes or more that fluid is still cold going through all those little needle bearing you mention . how does that help ?
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Old 04-04-2012, 07:49 PM   #10
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even with the thermostat the fluid is still roughly the same as the outside temp and if its -20 f so is the fluid !
so for at least 15 minutes or more that fluid is still cold going through all those little needle bearing you mention . how does that help ?
Yes it would be the same temp at cold start but because the fluid gets sucked through the filter into the pump, out to the cooler then it's first duty is the lube circuit in the transmission, Being it is just getting looped back to the trans before it goes up to the air to fluid cooler it warms up much quicker. The synthetic fluid is the biggest help for cold temps and extreme heat also.
Older Dodge trucks used to block out overdrive anytime the outside temp dropped below -20 for "Enhanced transmission durability" they installed retrofit thermostats on them as a service bulliten, then later ones came with the thermostats built in factory installed.
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