My tow vehicle is a 2003 Ford V10 excursion with 158,000 miles. Four years ago I put the 6.0L tranny cooler in place of the stock cooler. Before the switch, my temps would routinely run 190-205 in 9...
Sounds like it is running in the normal range now. Seems like it was running a bit below the normal temp range I would expect before. If it were me, I would flush the cooling system, replace the thermostat, and remove the upper radiator sight shield and make sure the front of the rad is not becoming plugged up with pollen etc.