240k miles? Holy crap. Think you are the highest mileage truck I’ve heard of. My 2017 has 89k. Was stock until 45k then did a delete tune and also changed trans fluid and filter myself. Never had any issues to speak of before or after the tune. Hoping to make it as far as you have or farther with the same outcome.Just turned 240,000 and water pump is leaking. Trying to find a YouTube on how to replace it. Anyone got any ideas. Bought this new 2016 and never had it back to the dealer. Completed services myself. Changed tranny fluid and filter front and rear 3 member lubes. Tranny was shifting hard till I replaced fluids and filter at 100,000 and fixed the hard shifting. Replaced again at 200,000 and still pulling strong. Put on a few sets of brakes. I haul a 27 foot boat.