seems hard to imagine that you are complaining of a lack of power? What rear end ratio do you have? Heck, my dually pulls my 13,500 pound fiver like it was hardly even there. And when I hit the large pedal on the right it really starts pulling hard. This thing has more gront than anything I have ever driven and I am totally stock. Do you manually downshift to get the RPM up in the range or are you relying solely on the transmission to do it's thing?