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Re: Converting to diesel
I am not sure who made the 6.2/6.5. GM did own detroit for a few years, but I think the engine was a GM design, not a Detroit one. I know 4 people with those engines, about 180,000 to 200,000 km is about maximum for them, whether they are old or new. They don't seem to just wear out, they either snap a crank or blow a hole in a piston.
I know that those older Dodge/Cummins engines can easily be modified for more power. The non-electronic ones just need the fuel pressure regulator adjustment turned up and the waste gate adjusted; and they produce good power. However, you are correct, those Dodge transmissions cannot take the extra power.
It seems as if the factory has deliberatly restricted power output to preserve the transmission. But those engines will easily go 1 million km between rebuilds.
Personally, if I were building this Willys, I would keep the gas 350 and just install a 4 speed auto overdrive trans (700R4) for better gas mileage and save the $6000 conversion cost.
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