9" and 315's
 

9" is in, but my 315's on 11" rims don't fit in there anymore. With the diff unsupported the back side of the tire was right on the bumpstop. We grinded those down when I first got those and everything fit perfectly. Now it seems, even with the axle under load from a jack that those tires/rims will be right on the inner fender well. Anyone else have problems with this? My stock SS rims with 285's fit.

I had the same issue. I bought an adjustable panhard bar to center things up (off a little with the 9 inch) and worked the inner fender wells and bump stops a little more. Worked fine.