I have a 03 6.0 4x4 gasser with a lance 845. Idk how some of you stay around 3k lb with a tc lol. I seem to end up around 5k lb of tc and **** on my truck. But it does fine. Worst part about the 6.0 is the way the cruise operates. There are many hills it will go up in od if you're working the throttle and only lose a few mph. But if the cruise is on then it will try to accelerate back to set speed. The diesels just chug on up in od and accelerate if needed.