Ok prove it, oh wait you can't..

Fact is the 6.4 didn't and cant. Would have, should have if it could have, but it can't. They ran the test twice and contacted ram engineers to be told its operating as designed AKA
EPIC FAIL. Blame the transmission all you want but it's a fail as there's only one transmission mated to a 6.4 in the 2500.
Don't like the fact a GM 6.0 beat the almighty 6.4, looks at the less power and less capable Ford 6.2.
Oh look a slow cummins, what's new.... At least it can move the load as advertised unlike the 6.4....
Ok lets put this to bed, the 6.4 is the best thing since sliced bread. It can out pull any truck every made, is the quickest and most efficient. Long live the 6.4.......
Now being that I own one I know thats a lot of BS, but if it makes the fanboys feel better there it is....
Tell us more....

how many model years did you end up going back to unload a 6.4??