I've worked on many cubs that still had the original pin, and the same goes for the rag joints. I'd say 40+ years is a pretty good test of time. If your pin keeps falling out, I'd say that it's time to replace the shaft. Or, like Don said, put some loc-tite on it. Both types of drives are fine, they don't need to be "switched over", just repaired. Take a few minutes, spend a few dollars and it will last another 40 years.
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