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First and foremost, CHECK YOUR COOLING STACK for blockages, plugged elements, etc.
Also, look between heat exchangers and make sure they aren't plugged with dirt/debris/etc.
Low pressure water across each cooler element will wash a bunch of the junk out of the cores themselves. Even if they look clean, they aren't.
There is a product that HVAC guys have that they spray on heat exchangers on air conditioning units and it foams up and pulls ALL the dirt and crap out of the fins.
This would be the first thing I'd check out before going any further.
And that being said - 190 isn't too far out of the way, especially in the city with low air flow across the cooling stack and in stop and go traffic, without the converter locking up.
My trans takes quite awhile to warm up, (the actual temp, not just on the gauge) but I typically see around 175-180 degrees with our 50 or so degree ambient temperature, rolling down the highway at about 62 miles an hour or so.
This is from the shop manual, it describes what temperature ranges move the needle to what area of the gauge.
The transmission temperature should range between -40 to 49°C (-40 to 120°F) with the gauge in the cold (C) range, between 10 to 120°C (120 to 248°F) with the gauge in the normal or mid-range and above 135 to 214°C (275 to 417°F) with the gauge in the hot (H) range.
It would appear the trans temperature gauge doesn't read HOT until over 248 degrees. Just something else to keep in mind. I don't think trans temps in the 200 degree range are too far out of the way, to be honest - Remember, there is an oil-to-water cooler as well, that will only cool the trans fluid to the temperature of the engine coolant. Yes, the oil to air will help cool it, but the one in the rad is only going to do so much.
Hope this is somewhat helpful.
Ford Senior Diesel Technician
2008 F-350 4x4 Off Road 6.4 Powerstroke Diesel
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