Normal transmission temperature
Cargo Master
Joined: May 2012
Posts: 2,616
Likes: 1,190
From: Door Cty/Florida
194 yesterday after two hours on the highway with nothing being towed. Oil was 201.
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Laughing Gas
Joined: Sep 2010
Posts: 904
Likes: 112
From: Austin, Texas
Yeah, after my replacement of turbo intercooler, radiator and trans cooler (after the deer incident), my trans temp just driving 55mph was 210. Didn't sound right... I don't know that I ever saw 210 before the replacements when towing.... Fun. Back to the dealership.
Cross-Country
Joined: Jul 2013
Posts: 61
Likes: 0
I monitor mine pretty much all the time and my trans temp usually stays at 190 at any speed or grade when I am not towing. Towing, it usually stays at 190 on flat ground and goes up to maybe 195 on extended 6 percent grades. My engine oil temp varies much more dependent on conditions and ambient temps. Low 190's is typical when not towing and not going up steep grades. 200 to 220 is typical when going up steep grades and when towing. The highest engine oil temp I have seen is about 235. This was when towing 12,000 lbs up a 10 mile 6 percent grade in 90 + degree weather.
Mike
Mike
Junior User
Joined: Aug 2012
Posts: 78
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From: Lancaster, CA
I monitor mine pretty much all the time and my trans temp usually stays at 190 at any speed or grade when I am not towing. Towing, it usually stays at 190 on flat ground and goes up to maybe 195 on extended 6 percent grades. My engine oil temp varies much more dependent on conditions and ambient temps. Low 190's is typical when not towing and not going up steep grades. 200 to 220 is typical when going up steep grades and when towing. The highest engine oil temp I have seen is about 235. This was when towing 12,000 lbs up a 10 mile 6 percent grade in 90 + degree weather.
Mike
Mike
It's probably the only time I've REALLY worked the truck as that was loaded up for a cross-country move from TN to CA. Normally I tow a ~9,000 lbs TT (loaded), so it's no where near maxing the truck's capacity.
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Laughing Gas
Joined: Feb 2007
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From: Waco, Texas
192 here, normal Interstate empty driving, towing 11k+ in Texas, looking at 202-208 varying on the hills. Going to give it a real test in a month, headed to Colorado and over Monarch pass then up to Taylor Park, will see then some real numbers.
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From: Frederick, MD
Going to Montrose to see the grandkids.
Postmaster
Joined: Sep 2006
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From: Maryland
Does this mean that the observations of other Superduty drivers are invalid?
Postmaster
Joined: Sep 2006
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From: Maryland
When the OBD is telling you 180 on a 5R110, it is really running more than a few degrees warmer. I had an actual gauge in the test port on my 2006 and it always read more than what I would read off the OBD with AutoEnginuity. My 5R110 would very easily reach temperatures over 200 towing heavy loads in high ambient temps.
It seems to me that the 6.7/6R140 relies more on the engine coolant to control TFT than a big cooler in front of the radiator. TFT on the 6R140 remains pretty stable under most loads until the ECT starts to climb. The temperatures move upward together on a linear basis.
As far as why the increase in temperature, transmission fluids have improved in recent years and everybody seems to be running transmissions a little hotter for peak efficiency. Years ago people would start to panic when TFT reached 200 and now it seems to almost be the norm.
It seems to me that the 6.7/6R140 relies more on the engine coolant to control TFT than a big cooler in front of the radiator. TFT on the 6R140 remains pretty stable under most loads until the ECT starts to climb. The temperatures move upward together on a linear basis.
As far as why the increase in temperature, transmission fluids have improved in recent years and everybody seems to be running transmissions a little hotter for peak efficiency. Years ago people would start to panic when TFT reached 200 and now it seems to almost be the norm.
Super Moderator
Joined: Aug 2003
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From: Isanti, MN
When the OBD is telling you 180 on a 5R110, it is really running more than a few degrees warmer. I had an actual gauge in the test port on my 2006 and it always read more than what I would read off the OBD with AutoEnginuity. My 5R110 would very easily reach temperatures over 200 towing heavy loads in high ambient temps.
Mark has said in the past that the maximum temperature for the outbound line to the cooler is 330°. Just did some searching around and found the post:
Where are the trans temps being measured? That makes a HUGE difference in the max temps.
If you are measuring from the transmission's temp sender, you're fine at 230F for no more than 1/2 hour. If you have a sender in the pan or pressure test port, same thing.
If you have a sender in the line to the cooler, 230F is REALLY cool. Ford didn't have a max temp for that when I left there, but we were working on specifiying a max temp of....wait for it.....330F in the line to the cooler. ATF gets REALLY hot going to the cooler. Maybe that's why there is a cooler......
If you are measuring from the transmission's temp sender, you're fine at 230F for no more than 1/2 hour. If you have a sender in the pan or pressure test port, same thing.
If you have a sender in the line to the cooler, 230F is REALLY cool. Ford didn't have a max temp for that when I left there, but we were working on specifiying a max temp of....wait for it.....330F in the line to the cooler. ATF gets REALLY hot going to the cooler. Maybe that's why there is a cooler......
