Dt360 into 1973 highboy in Projects, Builds, & Restorations Posted yesterday at 12:12 AM Not to rain on anyones parade, but truck/Ag/industrial 6cyl diesels in light duty trucks can be a step backwards in terms of comfort and drivability. A friend of mine was considering a Cummins swap into a highboy, and he got a chance to ride in the same truck that already had the swap. One ride is all it took - the truck vibrated and was quite loud. He also said if felt a bit imbalanced (front heavy/tail light). It turned him off the project. My swap is a 66 F700 cab on a IH chassis with a Dt466 - I must admit some days it feels a bit loud in the cab, vibrates pieces in the cab at idle/etc. And that’s a 5ton chassis with new cab mounts. Old cabs just kind of suck in terms of comfort - even when you try to insulate them. I feel a 5.9 Cummins is louder and shakes more that a 466 - something about a 466 seems abnormally smooth and relaxed. Not sure about a Dt360 vs a Cummins.