Bought truck with 20k on it. 2 years later have 160,000. Change oil regularly. 1 trans flush. Only been in shop twice for a total of 200 dollars. I drive all over the state of Texas to job sites in the middle of nowhere spend all day in 4wd at job sites and then get back on road for another long trip. I have had them all. Strokes, Maxes, all of them and the 5.9 is by far the best ever. Have the auto trans and have had absolutely no problems with it. If you are looking for a diesel HD don't even think twice about a Dodge Cummins. Just buy it. They will solve the emission problems. The Cummins is the simplest design and the toughest and the most reliable, etc, etc..
big torque, solid front axle, fuel mileage - 24 HWY with programmer.
none. leave it alone. Bring back the 5.9 take the emissions crap off.