well, i actually dont ever tow anything heavier than a bass boat and for the most part i drive like an old man since i'm so mileage conscious (never really take it up past about 2500 rpms, never even had it full throttle yet). i've also just been taking it easy for the sake of the stock trans. the hardest it ever gets romped on is on interstate on-ramps..oh, and btw, thanks guys. this is my first dmax. a world apart from the f250 ps i had for all of 6 months. i'm still trying to get past the learning curve