Hey my buddy asked me what they can do to their F650 tow trucks to get more out of them (power and econ). I asked him what diesel engines where in the trucks and he was clueless. I did some searching but I only got more confused since it appears ford may have offered several different diesel engine options made by a wide variety of engine manufactures. I found alot with cummins engines, some with Cats and I found some kind of rollback (can't remember F#50) with a powerjoke. Do any of you guys have any idea what engines came in which trucks? Like are they different year to year or what? Can you bolt up the tuners from the picks to the cummins or the powerjoke? I am sorry i have no clue when it comes to fords, I had one for a 1st car (hand me down) and have been a Mopar guy since after many times working on the built backwords ferds. The fleet is equipped with 3 F650 rollbacks, 1 F450 slinger ma-bob, and a F150. Maybe I can talk the owner in buying a dodge medium duty truck when the time comes, but lets try to keep this post about the ferds.