This is what i have having problems with my 06 F350 4x4. I will driving on the highway going at least 73mph. IF i hit a hard bump or bad pavement in the road the front end starts shaking real bad and the front wheels does it too, it feels like i have flats tires on the front. It seems like the whole truck shacks. I have to slow down fast (hope and pray that i don't get run over) or just pull over on the side of the road so it will stop.
I took this to my dealer. Guess what they cannot find anything wrong.
i told them when it does that the steering wheel shacks bad too. So they change something on the steering. But that did not do anything.
I just want to know if anyone is having this problem or what needs to be fix.

 

Search for "Death Wobble".. there are a lot of discussions about it.

 

Hey Dwight,
Check out this TSB. I was having similar issues. The truck for instance would hit a pavement separation going onto an overpass, and I was afraid I was going to roll the truck and trailer it would wiggle so much. The dealer performed the TSB listed ,2 years ago, including replacing steering wheel and the issues disappeared. Good luck. Here is TSB:

Steering Wheel Shimmy After Riding Over Bumps/Ruts:
Some 05 and 07 F-Series trucks may exhibit an oscillation/shimmy in the steering wheel after hitting bumps or ruts in the road. Typical steering wheel movement is 5 degrees and usually smooths out after about 5 oscillations. This condition is more prevalent on 4X4 trucks with steering wheels that have radio and climate controls. The truck will need to be inspected: tire pressure checked; steering damper inspected (replace with 5C3Z-3E651-D if needed); all suspension and steering fasteners torqued; steering checked for binding; steering gear adjustment checked/adjusted. The caster may need to be reduced by 0.5-0.75 degrees. After this, trucks build prior to 10-8-04 should have the steering wheel replaced.
King Ranch tan/pebble: 5C7Z-3600-ABA
Charcoal black: 5C7Z-3600-CBA
TSB 05 22-1, 06-22-14