Just seen the third vehicle have a problem running the OEM nut. What happens, floating washer on the nut breaks into pieces and falls off leaving the nut loose and axle free to float around. Over time, it can eat the hub away until it breaks and or the axle bearing disintegrates. In my case, ate the splines out of the hub leaving the axle free wheeling as if it were broken. Thankfully, Ford has an updated nut, best to change yours before you have an issue.
OEM nut with floating washer.