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67 Cougar/Mustang rear end???

3924 Views 5 Replies 3 Participants Last post by  67CougarMan
I have a picture of the tag on my rear end and was wondering if that could be decoded to tell if it is an 8 inch or a 9 inch as well as what gears would be in it too. Here's a pic of the tag. Any info would be great! thanks!


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Heres a better picture. from what I gathered it could be from a 75-76 Stang.


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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.
OK, I had to look at several sites to find something that matched.

Your tag decodes as:
From a 78 Mustang II
3.40 gear ratio
8 inch
Made 1977, Dec, 5th week

The WDY-W shows up in 1977 Mustang II and 1975-78 Pinto, but as a 3.00 ratio. It is possible there are other correct cars.

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Also does anyone recommend a better rear gear? 3.73, 4.11's etc... This is a drag car but a nice sleeping street. and a differential would be nice. Any first hand input would be great! thanks everyone!
**this isnt a drag***
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