Fixxxxer - hopefully you can help me out again (or anyone else).
2000 F350 Dually 4x4 7.3. 108k on it.
Had an occasional strange noise in the front end (grinding). Been followed up during my latest 500 miles with some occasional vibration like you are hitting grated road, or the "fall asleep strips".
Research indicates needle bearings in the front hub assembly or possibly the occasional sticking Auto-Hub.
I haven't gotten to lift it up yet and shake it around to see if there is any play. To my knowledge there has been no front end work other than one ball joint on the right side.