No idea WHY Ford made the change in 1967, BUT ALL Ford transmissions made the same change in the same year.onlythegood said:
SO DID ALL OTHER MAKERS OF ALL OTHER TRANSMISSIONS ALL IN 1967 IN THE U.S. Granted, some others were changed before that, but in 1967 the shift patterns were "standardized" across the board with only minor variations since then to accommodate the newer transmissions.
Coincidence? Not likely. So, I would assume that somewhere deep in the bowels of government bureaucracy there was some sort of law or rule or something made that forced the automakers to change, just like keeps happening constantly even today.