my dad has a dodge with the "old" cummins in it.....and swears it is stronger as it was than the new 6.0L he has in the new F450 he uses for his bee business as well.
No doubt in my mind either, that the cummins's I've been around are surely impressive. (not to say moreso than any other, since I've not been experienced in other diesels, firsthand......just that it's impressive)