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I crawled under my car to read some numbers from the differential. I have determined it is not a 9" rear end. Still not sure what it is...but I did find a tag held in place with one of the bolts and this is what it said, WDW U7GM (top row) and 4L11 8521B (bottom row). I do not fully understand all the numbers and letters. I am guessing the bottom row means it's a 411 with a equa-lock (posi), 8.5", manufactured Feb. 1971 week 2. Anybody know how to decifer all this? Please help. Thanks John
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