Hi guys,
I wanted to thank the forum for all the good advice. My drain plug was pretty buggered, see pic. The fluid was of unknown vintage, and type. I went with several of the suggestions for removing the plug: remove fill plug first, lapping compound, shop rag, pounded in plug tool, support with jack, and use a cheater bar. Came out, and so did some nasty fluid. I refilled my 84 3.2 915 with Kendall, 3+ quarts.
The shifting is vastly improved. Other oils might have been great too, considering what was in there.
Anyway, thanks,
Dave