Mine came loose, tightened it, and then had a grinding sound, the bearing was shot. Took the spindle off, went to a machine shop w/ spindle and new bearing to press it apart. They tell me the hub is too worn, it slides out of the bearing. So I had to go order a new hub and nut from ford. Then I put red loc-tite on it and torqued the piss out of it. It's been fine now for 2.5 years. Its the 4th time I had to do it to the car, ford tried the other 3 times, twice under a warranty, and couldn't get it right. I do it, now its fine.