Rear axle offset a little bit !

I was looking for help on this problem ! I have 205/70-14 all around on my dart . It also has air shocks in back . When the car sits on the ground the passenger rear tire to the fender well is tighter than the driver side and going down the road I get a slight cut on the side wall of my tire on the passenger side ! Can't hear it or feel it , but the inner lip of quarter is slightly cutting tire , would like to fix this before even thinking of new tires ! Any ideas out there ?