I'm doing an IRS swap on a fox body and it will be a street strip car. I'm gathering all the parts for the swap individually so I don't even have a diff yet. Should I start with a cast iron T-Bird housing? I've read very little regarding the cast iron housings, seems like most guys are making the aluminum housings work. Only one guy on here broke the ears off his aluminum, then went to cast iron, but the gears in his cast iron start making noise (maybe improperly setup?) and then he went back to an aluminum diff.