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Re: SM 420 shift pin size
Hardened steel roll pins will last a pretty good while, when I worked at Blumenthals trans. we used to do this to worn 420 and 465's, I just can't remember the dia. They are easily replaceable as well. I just ordered a 120pc kit on Amazon, it was 10 bucks. Should be in good shape.
This would be a great repair though for someone that has the tooling to turn some steel down to make some replacements.
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