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67 Cougar/Mustang rear end???

3915 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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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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