I am new to the game and have been told that my stock sway bars and shocks should be replaced as they are on a 2008 F-450 chassic with 11,000 miles. On the other hand I have been informed that I don't need to replace them. So it is the old story of the rock and the hard spot - - do I or don't I. Any advise? If replacing the shocks and sway bars wins out any recommendations?