When you get it apart I would look closely at the keys and springs in the hub assembly. maybe binding ?or a 63-65 synchro used with a later model hub.The hub and synchro have to be from the same family.63-65 uses non shouldered brass and 1-1/8 wide hub.66-74 shouldered brass 1 inch hub.You can use either matched assembly in either years of transmission but synchro must match hub.
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