The National Highway Traffic Administration has ended its investigation regarding steering failures on 336,000 Ford F-250 and F-350 Super Duty pickup trucks.
The NHTSA began their investigation after they received five complaints that the steering gear in the trucks had failed. According to a report on the matter, which was obtained by The Detroit News, investigators “found evidence of broken sector shaft gear teeth and piston damage consistent with incidents of single event overload.”
However, a later investigation performed by the NHTSA found “no evidence of fatigue or material property defects in any of the fractures. Analysis of complaint rates by vehicle build month showed no patterns indicating potential manufacturing quality issues and no difference before and after Ford introduced design changes to the input shaft and sector shaft seals in July 2007 to address potential leak concerns.”
The NHTSA believes the “steering gear failure was most likely a result of crash forces, rather than the cause of the crash.”