i have a 99 f150 long bed with a extended caband when you are doing about 55 to 60mph on the road the truck isnt under any load it will start jumping up and down but the tires never leave the road. It did it when i bought it from the dealer in 2005 or 2006. I have replaced all of the shocks and sway bar end links. i think it is one of the axles or something is out of balance. The driveshaft has had u joints put in it i had it balanced. What should i look at?
Dec 22, 2009 at 4:23 PM
