John
There is a lot of experience here, I'm sure someone can quote #'s and get you the information you seek. Here is what I can contribute, The MM4 came in two options, the first was the T10 or the standard BW 4-speed transmission, then there was the T21 option, this was the close ratio and I believe also known as the 83mm 4-speed. My '81 has the T10, and is fresh after new second gear, main shaft, bearings and synco's.
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