The 08 and 09 powerstrokes suck for gas mileage. Our work trucks barely get 9 to 10 mpg.

Are they 6.4's?

Go Cummins, get a later year 12v with the NV4500 stick. Amazing combo. 12v Cummins can make nasty power. From what I have heard from a Cummins tech you can make 700 horses with just a screwdriver on the old mechanical pump motors. Plus cummins just sound the best.

if you wanna race the truck get the cummins if you want the best all around get a duramax if you plan on pulling the truck apart and replacing head studs etc get a powerstroke. duramax's you can use a programmer up to 100hp then the tranny needs to be done they are the only weak link on the truck. powerstrokes weak link is the head bolts they don't take extra boost well and it is a serious pain to change. cummins problem is the whole dodge truck is gonna fall apart around it lol

agreed. the allison trannys are good for great power as they are...doesnt take much to make them good for 1000hp i know the new ones are food for like 850 or 900tq stock..one of the sales guys at work took me for a ride in a 2011 without letting it spool chirped first second and third it awesome lol

Ill stick with the only diesel made by a real diesel motor company. Cummins. And Duramaxs are still Izuzu hybrid motors. Thats their biggest problem LOL

Ive seen them all blow up or break. Not one brand doesnt have issues.

...well everything has the possibility of breaking and blowing up lol just part of the game

I guess at this point I just need to whip out a tape measure and see which chassis will fit best with the body I plan to eventually drop on it. I can go any direction depending on the day lol

If you put a 3rd gen body on that chassis I will drop a grenade in it...