[rallye bob]

Aubrey;
Did you swap the tires side to side to make sure it is indeed the (one) tire that is rubbing.
Maybe something in the rear end has shifted, or the body. I am not that familiar with all your components, or what "links" are used to connect your rear end, and/or body, to the frame, but I have seen this stuff shift, in drag cars (mine)....... :-(
Just a thought