I HAVE A 2006 FORD F350 4 WHEEL DRIVE SINGLE WHEEL LONG BED KING RANCH. I WILL BE DRIVING DOWN THE ROAD OR INTERSTATE ANYWHERE BETWEEN 30 AND 80 MILES AN HOUR, AND IF YOU HIT THE SMALLEST IMPERFECTIONS IN THE ROAD THE TRUCK WILL START SHAKING VIOLENTLY, UNCONTROLLABLE, THE STEERING WHEEL MOVES ABOUT 14 INCHES SIDE TO SIDE SO FAST AND HARD, THAT IT TAKES ILL I'VE GOT TO HOLD ON TO THE WHEEL. YOU CAN HEAR THE TIRES CHIRP SIDE TO SIDE ON THE PAVEMENT IT WOBBLES SO SEVERELY. I'VE REPLACED THE STEERING DAMPENER, THE POWER STEERING PUMP, HAD IT ALIGNED 4 TIMES, BRAND NEW TIRES, I HAVE ADJUSTED THE CASTOR ACCORDINGLY TO FORDS TSB FORUM, HAD MY ROTORS TURNED, AND WHEELS AND TIRES BALANCED SO MANY TIMES. ITS SO BAD, IT SHAKES THE STUFF IN THE BED OF MY TRUCK ONTO THE HIGHWAY. MY TRUCK ONLY HAS 92,000 MILES ON IT. IM AFRAID TO DRIVE IT. ALL I KNOW IS THAT I DIDN'T PAY 64,000 DOLLARS FOR A TRUCK THAT I CANT DRIVE. I WILL SPEND THE MONEY TO FIX IT, BUT FORD SAYS ITS A NORMAL CONDITION. *TR