Allright, with some of these fords, when u go into 4wd and then back into 2wd, some require you to back up any where from 10-15 feet to disengage the automatic locking hubs. We had a 95 isuzu trooper that used to do that untill we read the manual. Our 98 f250 will shake like a mother if we dont back it up after we take it out of 4wd. Give it a try.