Those are nice pieces but most don't know how to brace the rear correctly and the N case, while certainly the stoutest of the stock stuff are tough to find. There's a SA Workbench book on the Ford 9's that gives a lot more information about the stockers along with setting them up. Dana 60's are great, just too damned heavy. We have one in the Corvette and so far, so good other than the frickin leaks we keep chasing.