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#1
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The A B C ratio indicator didn't start to be used until the 1969 model year (Oct 21 1968)... Crash
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#2
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Sorry abut the misinformation on the A B C codes, my over sight. Indeed they were not used until 1969. Use the input shaft for ID 2 groves =M20 1 grove = M21 no grove = M22. Just try to help out . Tony
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