Originally Posted by
KC8QVO
Are the axles and ring/pinion gearing still the only things that change on the heavier service medium duties than the regular super duties? Or is there a transmission change, or gearing change within the same case, in the bigger trucks?
Hey Steve,
The PSD engines have always been used in trucks up to F-550s, and they have the exact same driveline as the F250-350 pickups with the exception of axles.
Different gearing in the axles, but that's about it. Back when the '08 6.4L was introduced, Mike Rowe could be seen in one particular video talking about how the cooling system of the F250 was designed to cool an F-550.