While wrenching on the 57 Fairlane sitting next to my soninlaw's scrub with a 9 inch Ford rear, His friends drinking my beer said that the 9 inch was not Fords, but produced for Ford.. so justifying the use in scrubs.. Does anyone know the history of the Ford 9 inch..??

Brother and I own/operate 1957 Ford Fairlane 312/4x2 and two 1963 Falcons 302 rollers carburated 600cfm, FE427 sitting in shed..