This is a great forum @patriot23 and with proper care and maintenance you'll find guys like @gsbrockman who ran his 2018 4500 for more than 450k miles and is likely well over 30,000 miles on his 2022 5500 right now. Not the same transmission, I get it, but it's worth referencing in my mind. My 2011 made it 240k before needing transmission repairs. It was ran stock for its 234k miles.