Engine swap from a 392 gas to a 5.9 Cummins
I would like to swap my 392 International gasser for a 5.9 Turbo Cummins to improve fuel mileage. I get around 7 mpg right now with a manual 5 speed, and would like to get it up to around 12 or 13. If I can't get it somewhere in that neighborhood I will have to rethink the whole idea of converting my schoolie. My VW diesel Jetta gets around 40 mpg even hauling my teardrop trailer, so it makes me cringe to go anywhere in the bus.
Does anyone know if this is a fairly common swap? I understand I will have to change the rear end ratio also. If you know of any common pitfalls or expensive gotchas please let me know.
It don't make no sense that common sense don't make no sense no more. - John Prine