In the process of transplanting this 1992 12v into a 1979 F250. I have always wanted an old cummins, and even though the NP435 doesn't have OD, 3.54 Diffs and 39.5" swampers should bring the RPMs down to 1800 at 65 mph, in 4th gear. I used DCS's motor mounts, an 11" ceramic clutch and a ford...
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