[rotorwrench]

On king pins in general throughout the years that Ford used them, I've seen pin sets come with steel and bronze plates substituted for ball bearings, small ball thrust bearings with a high count of balls, and large ball thrust bearings with a lesser bearing count. This stuff is all over the place in quality. I prefer the ones with the larger ball bearings like some of the later cars had. They seem to last better and can take side loads well when driving on uneven surfaces. I'm not sure about roller types since I haven't seen how they are designed. Tapered roller types might do better than flat types for side loading. Shielding from road muck has to be good on any deign used or they won't last long.