ok so the next project,,lets stuff a cummins in your chebby...lol will need to lift the body 3'' tho so the oil pan can clear the front diff..

Hell no. Im quite happy with the Vortec 454. Smooth as butter and quiet as a mouse! Plus that baby gots new intake gaskets, new LS1 injectors, new distributor, wires, plugs, belts, hoses, starter, coolant, and a Blackbear ECM tune. Edelbrock stainless headers on the shelf waiting to go on. I think I have under 500 in all that. lol

Empty manning 45ft steel trailer running 80-85 from KS to FL my 2011 chevrolet 3500 CCSB got 15 hand figured. Loaded with boat on the way home we saw 10 flat. Same speeds. Empty the truck gets 17. H&S programmer and rest is stock

I love mine when its running, never drove anything quite like it. But they are just ticking time bombs, radiators, HPFP, rockers, rocker bridges, EGR, pistons cracking, injectors. Me personnaly a spun main, new reman w/ less than 8k miles on the clock now believe I have a wrist pin issue. Anything over 100K on a 64 needs a new HPFP or you"ll soon be replacing all 8 injectors & everything fuel related from metal in the lines when HPFP goes.

Yep, very good price. I got $7000 (real $$ after a cash deal was already made) on trade on my 2001 2500HD CC with 140k and 4k worth of hail damage 3 years ago when I traded it on my 2007 with the same package.

As much as i really want the F250 7.3 i found i think everyone has convinced me to go the gas route, i found a nice GMC 2500 w 6.0 thats in my price range the 8.1's seem to be really hard to find. Its rated at 10,000 lbs towing and i will never go bigger than a 32/35 so it should handle the job. now if i can just sell my F150!

Hold out for a 8.1L if possible. The 6.0L has the piston slap issues, and it also does not come with the Allison Transmission.

The 6.0L gasser will do OK, but it lacks in the passing gear and climbing a grade ability. They were primarily placed in fleet trucks, well loaded with utility beds and the like but do not tow much.

There are WAY too many variables to talk about fuel mileage. How many of us drive a "stock" truck? My last stock truck was a 1989, and I modified that one too before I sold it.

Tires, gears, wheels, brakes, mirrors, bug shields, windshield visors, cap/tonneau/open-bed, srw/drw, 2WD or 4x4, lift or lowered...
ALL drastically affects fuel mileage; and that's before we get on the scale to weigh the boat.

I have a 2004 with the 8.1L and the Allison Transmission. My GM dealer didn't even realize the 8.1L and Allison tranny were put together until about the fourth time I brought the truck in. Goes to show a little bit of incompetence on the research and history end on there part, but also lead me to believe they haven't seen very many coming in for repairs either. I currently have 100k KM (Canadian, so roughly 60,000 miles?) on the truck and for pulling the boat I love it. It is a little bit stiff in the rear end and tends to bounce around when no load is on it as well.

I also let tire pressure out, the truck came stock with I believe (quoting the top of my head) 75 psi in the front and 70 in the the rear (dually) and at around 50 and 45 psi respectively it is a much more mild mannered truck with out a load and feels even better with my boat. I have very minor tongue weight with the trailer, less then 400 pounds. I dropped the psi as I was burning the center out of the tires at roughly 20,000 km.

Good call Kings11. I forgot about tire pressure, which also affects fuel mileage.

Lucky Strike stated years ago they run 65 front and 60 rear on their dually, and when I had stock wheels/tires I was running the same. I switched to some Goodyear tires which were WAY too soft for a dually application and had to pump up the front tires to avoid feeling like I was driving on wet spaghetti.

I am now running 19.5 G-rated tires, and I think I am running them in the 50-60 psi range, but I have not checked them in a while.

I had an 8.1L in my Avalanche 2500 which comes with the M32 transmission in that platform, NOT the Allison. My transmission had issues at brand new, but warranty fixed it up.