How many have failed under normal operating conditions?
How many who "said" it happened under normal operating conditions were being forthright and not scapegoating Ford to get out of being responsible for trashing their cars at excessive speed?
I would think if this was anything but isolated incidents there would be a news story somewhere
on the web, but there is not. I could not find even one mustang driveshaft failure - Google Search ford driveshaft failure - Google Search