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The short answer is "it is worn out". Although everything mentioned above contributes to this condition, the main villain is the clearance for second gear has exceeded it .004 to .006 value on the mainshaft. It probably is now .012 or higher. And of course to get to this area the whole thing has to come completely apart. There are no shortcuts. Get MacVP book and have fun. When you do it correctly and completely, you will enjoy your efforts.