floor guy, not to hi jack the thread, I drove dodge diesels for 15 years, great trucks except for an '06 which cost me 7k in out of pocket repairs to get it to 95k miles, every suspension part went bad and some even more than once, the new trucks have the same suspension. bought a 2011 ford with the new 6.7 so far its been great and gets 20% better mileage than the old dodge. the problematic fords were the 6.0 models those SUCKED big time. the later 6.4 was a little better but chocked by emissions controls and didn't get much better fuel mileage than a big block gasser.
some people have great luck with GM, I haven't seen it, with exception of maybe a few buicks and oldsmobiles, everything GM I have owned or driven at the various places I have worked have been garbage.