1978 Ford F-250 with an Allis-Chalmers Turbo Diesel Inline-Six

1978 Ford F-250 with an Allis-Chalmers turbo diesel inline-six

Mitchell Geary always wanted to perform an engine swap with some type of tractor engine. He saw his chance after his Brother was offered two engines from combines. They inspected both engines and chose the best one, an Allis-Chalmers turbocharged 301 ci (4.9 L) diesel inline-six. The engine choice also carries a special place in Mitchell’s heart since his family always used Allis-Chalmers farming equipment on their farm. The diesel inline-six eventually found a home in Mitchell’s newly acquired 1978 Ford F-250. He mated the engine to a ZF5 five-speed transmission pulled from a 1997 F-250. The powertrain will remain stock for the time being but Mitchell plans to upgrade the axles and parts on the engine down the road.

1978 Ford F-250 with an Allis-Chalmers turbo diesel inline-six

1978 Ford F-250 with an Allis-Chalmers turbo diesel inline-six

1978 Ford F-250 with an Allis-Chalmers turbo diesel inline-six

1978 Ford F-250 with an Allis-Chalmers turbo diesel inline-six

6 Comments

    • Aaron

      I’ve seen some use a John Deere turbo diesel. At least it’s another option since Cummins are hard to get a hold of, and CAT are a pain to work with. I’ll bet with the truck and what gearing he uses, I’ll bet he’s close to 16 city and 20mpg highway, being realistic, unlike other diesel swappers.

      • Mitchell Geary

        I haven’t had a chance to drive it enough to calculate a mileage, I need to regear the axles or put in different axles. It is currently 3.54 gearing, and I would like to be 3.73 or 4.10. So my reverse and 1st gear are way too fast right now. And I’m having issues with the rims not centering like they are supposed to so going over 40 is not very good for it right now.

  1. Kyle

    Did you have to do many modifications to make it fit to the trans to get it to bolt up or did it just bolt right up cause I have that same motor I’m a tractor that has a bad trans and 97 Ford F-350 with a bad motor

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