I know this is an old thread, perhaps even a dead one, but my BA met its demise at the hands of a tree a while back. I now have a BF. But it's a 4 speed XR6. It has LSD too. How hard would it be to make the conversion from 4 speed auto to 6 speed auto for the BF? I think I could possibly be up for a new transmission soon anyways...

So basically the better idea would be to take a BF and swap out the ugly front bumper, interior, and dash cluster with the far nicer BA ones?