Then it has to be a typo, or a part that was superseded by 1982 by another part number.
I doubt that it was superseded, because I would assume (Yes I Know
) it would still have it in a 1982 book, just R/B'd to the new Part Number.
So my best guess is a typo, and possibly a reason why it never sold, etc. . .
I like a good mystery too, but this one we may never solve.
Truck: 1981 F-150 Explorer / Engine: 300-6 California MCU Feedback System / Trans: T-18 - 4 speed / 2.75 Ford Rear Axle Open Diff.