Counting teeth would give you an answer for sure. I don't know this for sure but I have always been told that the 30 and 44-6 Masseys were geared a little lower than the 33 and 44's because the flathead engines ran so much faster, same ring and pinion but slower in low gear, if that is true then you already have the slow gear in your 30. You would have to get into a parts book, I don't have one.
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