Originally Posted by Labnerd

Ford decided to not put a diesel in the F-150 due to the torque characteristics of the newer gas engines almost duplicates the higher cost diesel engines. You can convert any truck you like to diesel and a lot of folks have done so but it comes with problems in the future. Diesels have a lot of vibrations and harmonics that a gas engine doesn't have. Frame steel will fatigue if not made specifically for a diesel. I have a great friend that put a modded Cummins 5.9 in a 1979 F-250 4x4. Beautiful truck but even though I told him he was going to have problems, he did it anyway and is now having our engineers figure out how to save the frame from more micro fractures. So yeah, you can put a diesel in anything if you have the money and don't mind a few issues.....like the frame breaking.