727 reverse failing.

Hi out there.
I have a 1964 727 Torqueflite auto box which has just started to lose reverse gear (almost completely gone).It had being standing for many years. I have filled and drained it a couple of times before running under load. I'm just a regular guy so no heavy technical answers please. I have looked at other threads on this subject and have seen many different answers. None of them has mentioned something that I have noticed in my situation which is coupled with the reverse going....

727 reverse failing.
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