GL-4 stuff is still easily available here and what I use. Oreillys has a GL-4 brand that works well and the sta-bil that I also use is still available here. Napa always keeps it in stock on the shelf.
As far as synchromesh goes I don't think using it in a Muncie is a good idea. That stuff is much thinner and designed for newer modern 5 speed transmissions
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2019 Pontiac Heaven class winner
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