WDY is always an 8" rear axle and the -W tells you the ratio. Except I don't find -W in the Ford car parts manual up to 1972. Some sites say its a 3.00:1 but that is easy enough for you to check.
7FE says it was made in the 5th week of June more than likely 1977; June 26 was the first day of that 5th week of June. That would explain why its not in the 1972 parts list.
7FE says it was made in the 5th week of June more than likely 1977; June 26 was the first day of that 5th week of June. That would explain why its not in the 1972 parts list.
