The rear tires on my wifes Liberty are wearing significantly more on the inside of the tire. I can't remember what they looked like the last time I rotated them so there is a definite possibility that the un-even wear is from the front end. Does anyone have any suggestions for wear to start looking to try and figure out what is causing the problem. I do remember that right after I rotated the tires last time I had the front ball joints replaced under that recall. Could this have caused the problem?