VIOLENT FRONT END OSCILLATION

What NHTSA is examining

This investigation was opened based on 78 consumer complaints of severe suspension and steering wheel oscillations after the subject vehicles traveled over an uneven surface.odi was concerned about these complaints because many of them alleged loss of control and the loss of control occurredat speeds above 50 miles per hour.at the time these complaints were received, odi was also aware of the tsb 07-10-10 and early warning field reports that discussed the shimmy condition on the subject vehicles.since opening this investigation, odi has confirmed, based on consumer complaints, warranty data, testing conducted by vrtc, and odi inspection of complaint vehicles, that the owners of the subject vehicles are experiencing shimmy events on their vehicles.however, odi has also confirmed that owners typically do not maintain their tires at the pressures recommended by ford on the tire label.further, odi has found that in order for shimmy to occur, tire pressures must be substantially below (at least 20%) those specified on the vehicle tire label.odi considers these unsafe tire conditions to be the result of one of three typical situations.the tires are being improperly maintained, the owners are intentionally setting the tire pressures low to enhance ride quality, or aftermarket tires (not designed for use on the vehicle) are installed to change the appearance or function of the vehicle.the subject vehicles are intended and designed to be used as heavy duty vehicles and as such…

Vehicles under investigation