If in fact nothing happens with the deck lift lever, it says the charge pump is not working. That could also affect the hydro as it supplies charge oil to the hydro. When hydro leaks off then no more oil so no move.
What is trans oil level?
Maybe a sheared key on the "transmission gear motor" which I think is the charge pump on this old transmission.
Any of the above could be wrong info. My best shot.
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