I purchased a new F250 4 x 4 Super Duty in January. On several occasion the front End goes into a severe vibration and I almost loose control. I brake hard and the vibration goes away. I keep the tires inflated to 60 psi in the frons and 70 in the rear. April I received a letter from Foprd this is a problem with this model and the suggestion is air presure? I have not changed the truck as it only has 23k and under fuill warranty. I wonder if a stiffer shock would help?
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