Been a few years since I've ventured onto FTE. Traded in the 03' 6.0l with 333k miles, on a 13' F250 6.2l demo......it's gasoline/CNG. Had 5k miles on it when I bought it, it has 10k now, and no complaints. My question, is it normal for this transmission to run 200-207 degrees running down the highway on a 50 degree day?

My 6.0l and 7.3l's, the transmissions never ran even close to that, even when towing.

 

Your fine.

 

As per TDeisel's post

https://www.ford-trucks.com/forums/1...l#post13528198

I usually run around 190°F for my truck and the most I ever saw was 210°F towing my trailer up a long grade for 5 or so miles on a warm summer's day. However no long grades, I generally ran mid to upper 190s range while towing the trailer.

IOW, you're fine.