Those cummins engines REGULARLY run a half million miles, there are people on forums who have over a million. My trans is cool (not that POS auto) Shocks go out it's normal, things break under an 8800lb truck, but if you have a manual (they beef up the drive train quite a bit, from a 3in drive shaft to a 4 in and from a dana 70 to a dana 80) the drive trains are solid as hell. My truck is sitting at right around 200K, just did new brakes, and the interior still looks good as new.Read above, the motor is the only thing good in that truck, its not like i am making it up, or the only one saying it, his truck might get 250k, maybe ill only get 200k, but at 200k, the rest of my truck is still fine, while his will need shocks, coils, joints, tranny and diff problems, and im sure more. Read above at what zubdub said, dodge isnt exactly known for reliability. I can probable even argue that a modern gas motor will last longer than mooshoo's diesel which ill venture a guess is probably not running a stock tune. I personally would rather know that the only problem with my truck at 200k is the motor, fix it, and my truck is "good as new" rather than say, well, my motor is nice, but the rest of it is about to fall into a hundred pieces. Zubdub for reference.
Not a stock "tune" (don't have a computer can't really tune it) I have my truck ungoverned with 60LB valve springs that bring my red-line up to 4K instead of 3K, I also have a different plate in my fuel pump. Far from a beast like some of my friends truck, but I'm making about double stock horse power (thought that's still only around 350) and have no worries of my engine being less durable