Ford made 250 and 350 trucks with auto locking hubs. Parts are no longer available thru Ford. My truck is a 1996 F-350. A special socket-OTC part #6796 is needed to remove the FW bearing locknut. I spent two days finding this out. If you have the truck with the auto locking hubs this is a well kept secret. Do not buy A truck with these hubs without allowing for the price of aftermarket replacements.