2010 F 250 4x4 diesel, when driving around 50 mph and slight turn to left, I have hit little washboard in road and front starts wobbling and have to slow to 30 to get itto stop. Have had tires and wheels rotated and balanced and have replaced shocks, still does it, any ideas?

 

sounds like classic death wobble...it is bad on the coil sprung front end

 

It would not surprize me that the front wheel bearings are going bad. It's really a poor design that Ford uses now. Ford took a solid wheel bearing design and substituted a front wheel drive style bearing arrangement in it's place.