dewey, That tag is from a 8" Ford Rearend. Thats not to say that you don't have a Ford 9". I pulled a Ford 9" 3.00 gear from a pickup truck that had a Ford 8" 3.50 tag once.
You'll need to count the ring gear teeth and divide by the number of pinion gear teeth to verify the gear ratio you have.
Heres a good site to help identify Ford rearend parts.
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