Wrong, Ford did not build the 9", they had some input on specs but the diffs were supplied to them by the same company that made Detroit Lockers. Ever wondered why a detroit locker will fit and is almost identical. Found this out when pulling down a mates F100 some years ago. Amazing what a bit of research will uncover. The original doccumentation even stated it was a 9". One of the ones that got through apparently that was not stamped as a Ford, supply issues for a while we believe.

