My '82 Mustang GT has many obsolete technologies on it, all of which I've looked at replacing. The four to five lug conversion, rear drum to disc brake conversion, and 7.5" to 8.8" rear. I figured I'd make it easy on myself and attempt to combine the three projects as much as I could. Now, does anyone know of any reason why I can't simply bolt up an 8.8" 31-spline (an upgrade from the 28-spline, someone tell me if there's a problem with doing this?) 5-lug rear end? Also, if that's possible, what's left to do to convert the rear from drum to disc brakes, or do I simply need to purchase an appropriate brake kit? As well, will the fact I've chosen to go with a 31-spline axle instead of a 28 limit my choice of brake kits?