True Mike, and reread my post as well and it sounded snarky and that wasn't the tone I meant. Sorry about that. I was at work when I typed that and I really didn't finish my thought. The other issue is all the rear ends are assumed to be 9" versions. An 8" rear end was also a Ford option with at least 2 more, could of been 3 more, rib configurations to throw into the mix.