Re: vibration 4x4 shifter and front end f250
If it does it with the front prop shaft disengaged, then the source of the excitation would most likely be in the rear end....
Prop shaft bent/unbalanced?
Springs/shackles/saddles/bolts all okay?
If the vibration is tied to road speed rather than engine speed, you can discount the engine/trans as being the source of the vibration. The transfer case may be the culprit, since it is tied directly to road speed, but it's darned unlikely, as they are so simple, and have such low rotating mass.