Hello, I have a 2006 mustang GT at 106000 miles. Fairly stock, JLT air filter tuned, with straight and SLP mufflers. I have replaced the fan, radiator, coolant, water pump, and thermostat. I hooked up my sct tuner and as I'm driving it stays between 198 and 208 degrees in 1st through 4th gear. As soon as I hop on the freeway and throw it in to 5th it will reach 230 within 10 minutes and climb to 236. I will pull over and let it cool down and continue to drive. I do not have a clue as I have changed everything I think is associated with the temperature. ANY ideas or suggestions will help, thank you for reading.