I'll try to help as best as possible. You will need to pull your reversing gear completely out to remove the tail shaft. That means removing the entire rear housing. The hardest part of the job is pressing the cupling on after taking it off. It seems you are going down the right path, just plan on removing the entire rear housing and pulling the reversing gear to inspect it and fix as needed. I think we must be getting to a critical time in the reversing gear life cycle. I have seen tons of these post as of late.
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