At one point Ford did have a steak in cummins, but that was long ago. The LB7 Duramax(First year) Had injector issues, but the ones since are good trucks. The LLY Duramax 04.5-05 Had overheating issues, but they are easily fixed with what is called an LBZ Mouthpiece or a Killer Bee intake. My dad had an 06 LBZ and currently drives an 08 LMM without any issues.
I see. Well, I'm glad he has had good luck with them. We gave up on duramax because like I said, we had no luck with them, but if your dad does, more power to him and his trucks. I just read a few minutes ago (don't know how reliable the source is) that cummins has a new agreement with ford to manufacture diesels in many of the F-Series trucks. Any idea if this is legit? I know Ford will be offering diesels in the new F-150s but don't know if they will be cummins or powerstroke. I want to say it's going to be a 4.4L.