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Discussion Starter · #1 ·
I have a late 1999 E350 box van with a 7.3
and a 2004 E450 with a utility box on it but it has a 5.4 gas
Is it worth the trouble to put the diesel in the 2004 E450 to utilize the bigger frame, brakes, hydro boost etc.
 

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It would be a wonderful vehicle in the end, but the swap would be nightmarish. The entire wiring harness would have to be moved over along with the instrument cluster, PCM, IDM, GEM module, etc. It would be a herculean task. It would be easier to put a Cummins in the E450 with a kit. That would allow you to keep the 2004 the way it is and use the prefabbed kit to "fool" the PCM into working with the new motor. You'd also need to lose the gasser transmission to make this reliable.
 
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