OK, Thanks... Didn't want to start a conflict, but "As it is written so shall it be" seems to apply here. The Fords use 9/16" at 140 and it's kind of a flange nut. At least not conical... Might be easier to get clamping force with those Ford nuts since the washer component of the nut doesn't turn while you tighten the nut, so less torque effort lost to friction. We're actually supposed to apply a drop of oil to let that nut work free against the washer part.
And, a 5/8" fastener is a big step up from Ford's 9/16"
Even better, torque to 350 and that "average bear" isn't gonna be stealing your duals...
