Well, as it turned out Saginaw changed the part number in 1986 to a 525 from a 122 I am told. So in essence it is the same box on the outside. Perhaps then they changed a few internals for ratios etc but I do not care now as it is technically the same physical size which is important as this fella is going to use it in a '40 Ford for cross steering. Perhaps the mystery is solved.