We took a drive around the block and discovered that the right rear tire contacts the rear upper corner of the fenderwell (where the trim is attached). When measuring, we see that that side of the rear axle is 1/2" further back than the other side. You can see the difference in the two pictures of the rear wheel wells.
What locates the rear axle onto the leaf springs? Can the axle be moved forward and back? I thought there was a pin or locator to insure the axle is in the right location. I do, however, see a lot of Novas and Camaros dogtracking because the axle is not straight.
This is intersting that you bring this up as I have this same problem with my rear end. I have about 3/4 of an inch difference from the left to right side and have never been able to figure out the problem or find anyone who knows why this is. Would be interesting to figure this out or if this is just how the cars came out from the factory. Has your car ever been hit? I thought that might be my problem since mine was hit prior to me owning it but everything seems to measure out correctly. I have heard of a couple of other folks saying they have the same problem but nothing to explain it all. I even loosened up the U-bolts and tried straightning the axle in the wheel well, but only got a little bit of movement to take it to 3/4 inch difference. Would be interesting to hear from someone who had this problem and figured it all out.