Kent, The Dodge truck engines will work in a tractor, but you have to make some modifications to make it happen. The main problem with using a truck engine in a tractor is that the truck engine is mounted on rubber mounts and the tractor engines are mounted solid. That means that the truck engine can move and does not have to be balenced nearly a good as a tractor engine. You would probably have to balence the engine or mount it on rubber mounts on the tractor. The other big problem is the fuel pump. The truck engine has a pump with out governers. When the pickup comes agenst a load you just press on the throddle. When a tractor comes under load you need the pump to push the engine, so you will need a different fuel pump. Also the flywheel and clutch is wrong, the bell housing is wrong, the turbo and manifolds are in the wrong place, the fan mount is wrong, etc. These are all things that can be changed on the engine and can be made to work, but at what cost???So as you can see you will need to change an actual truck engine quite a bit to make it fit and work correctly in a tractor. Really you would be better off to buy an industral 5.9L and not change as much, or hardly anything. Dodge makes two different B series engines, the truck and the industrial, and they make several different models of each type, 12volt-24volt, High output- low output, etc. That is good because you can put a cummins engine in almost anything, but you have to have the right model and series to work well. If you got a really good deal on a truck engine cummins would probably work with you on swapping parts so that you could make the engine work, they have been really good about doing that for me. But you would have to look at the cost of changing the engine, may not be worth it... Just my 2 cents.
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