I have a 1999 f350 7.3. I'm having a problem where the steering wheel shakes back and forth and the whole truck wobbles. It happens at all speeds, but shakes faster at faster speeds, slower at slower speeds. At first the wheel was just jerking randomly but then I made a right turn, heard a pop, and then it was shaking like crazy. I jacked up the truck and checked the ball joints, checked for and play in the tie rods, and turned the wheel left and right. Everything seems ok so I can't figure out what is causing to wheel to go back and forth. Any suggestions?

 

Check your ball joints again. This time jack
the truck up, remove the wheel. Then shake your hub up and down, see if you now have movement. I bet you will. These tires and wheels are so big and heavy its hard to get everything to move. Try what I suggest and see what happens, let us know.

 

It seems to be that I had a bad tire. I rotated them and the shaking went away. Now the rear seems a little loose at higher speeds but at least the truck is drivable. Now to figure out why my 4x4 isn't working...