I have friends who are circle track racers and I hear often about how strong and easy to work with the Ford 9" rear end is. I've looked into it and there are companies that make 9" rears with the correct brackets to fit under a fox body ( Moser and Strange both come to mind but I'm pretty sure there were a couple others ). My question is - if it's such a good rear end, why don't I see it done much with foxes ? Is it the expense that is more of a deterrent or is it that the 9" rear is not that much stronger than a nicely built 8.8 rear ?