Those numbers are rated at the crank, I am talking rwhp, most stock lb7's Dyno 240-250 with a little over 400tq, I have owned one and with stock programming it's not happening unless we are talking on a dirt road or wet tar.
Thanks man... right now after the dyno day im at around 375 and 660 tqstrongly dissagree. driven just recently a duramax with just a mild tune, 4.5' turbo back, and a cold air. very basic upgrades, and the truck was a pure monster. easily believable 40 mph if not more! I'll say it again, that is a beautiful truck.
Nothing major just a light bar under the tailgate.. 2 12" subs, pioneer touch screen, 1000w amp.. Edge evolution race tuner. saving my pennys right now for a built tranny.. Going to cost me about 4000$ to build my stock Allison to hold 750whpWow been a while. so what have you done to the truck??!!