Home Forums Gear Hunting Trucks and Four-Wheel Drives any ford to cummins conversions

There's no way you're doing that swap for $1k,

I know your's is a 3/4 ton but, are you running the stock motor?

I had a 78 F-150 with a 351M/4-speed trans and a 79 Bronco with a 351M/C6 auto and it was a tale of 2 motors. The 79 was stock except dual exhaust. It was plenty fun for a 16-17 year old kid. But, It got about the same gas mileage as you're getting.

My 78 which I did an amature resto on, was a different tale. It had mild cam of unknown specs, (stock valvetrain) otherwise, stock distributer, new plugs, wires, filters, an edelbrock 4bbl carb and intake, headers, and dual exhaust with no name glass packs. After that it got a legit 14mpg.

Mine is stock except for RV cam and dual exhaust. Has c6 auto with 3;54 gears and on a good day straight down interstate at around 68mph it gets close to 9. Be hard to add 5 mpg to that.

Might be money ahead to get a gear vendors overdrive.

I've sure thought about it with a 95 F350 flatbed dumptruck I use. I get 5-6 mpg every day in that pig, and gutless as hell to boot. I don't think I could get 7mpg if I through that POS out of an airplane from 40,000 feet.

A Cummins would sure make a good truck out of it. Only reason I haven't done it is I have a pto for the dump body running off the Ford auto trans and I wouldn't want to keep the auto. Don't want to lose the pto as it cost a couple K when I had it installed.