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The recall is for a potential issue with the output speed sensor, as part of the cars transmission assembly. For some reason, under certain conditions the car could force a temporary downshift to first gear, potentially causing the rear wheels to slide or lock up.Ford has received three reports of crashes from exactly that happening, no injuries reported however.Affected vehicles are equipped with Ford's 6R80 six-speed automatic transmission; Mustangs included were built at Flat Rock between August 19, 2011 and February 21, 2012.Dealers will first inspect the PCM for trouble codes, if none are found they will update the PCM software, which will eliminate the potential downshift in the event of a fault.If trouble codes are found within the PCM, Ford will both update the software and change the transmission lead frame at no cost.