the dually's are usually 4.10s aren they? theres a sticker in the glove box on most of the trucks ive seen that shows the ratio. my truck is an 03, first year of the hemi, i think you could get a v10 in that year too, anyhow, my truck is a 5spd, i definately think the manual trans helps these trucks get better mileage. the hemi is a really fun motor for ripping around, and it will tow but it doesnt have alot of low end. if i was towing or hauling heavy enough to need a dually i dont think the hemi would be my first choice.I'm looking at an '06 dually with a 5.7 and it says 6 speed. I don't think you could get a 5 speed after the NV4500 could you? 5600s are 6 speed, as are G56s. I'm guessing 3.73 or 4.10 gears, and I would run 285/75R17 which is 34x11.00 ish. With 3.73 I guess that would be similar overall gearing to yours. I'm still leaning towards a diesel, but I found a gasser with 120k on it for under $9k. It's got me thinking.
the dually's are usually 4.10s aren they? if i was towing or hauling heavy enough to need a dually i dont think the hemi would be my first choice.
I have a hemi in my 2500 with the 5 speed auto. Would love to have a manual!! Best mileage I have gotten yet is 15L/100km (~16mpg) with a pretty solid tailwind. I average somewhere around 18-20L/100km with a mixture of city and highway. Ive always thought the only thing I would change on the truck is to a manual. Not sure where you are at but here diesel is still more expensive than gas. . . .