A-833 Lube help

When it was rebuilt were the syncro rings changed, and if so were the synthetic compatible ones installed? I think all new replacements are, but if you have the old style I would not recommend synthetic lube. It is too slippery and will cause hard shifting with the original style syncros.

I have run both regular gear oil, and ATF. They both work just fine. If you are in a warmer climate or plan to tow etc I would stay away from ATF.