My brother rebuilt a 1969 M20 Muncie and filled it with synthetic and it shifted poorly. He drained it and refilled with good ol' dinosaur goop and it shifts great.
This is what he used when the synthetic failed:
http://www.crcindustries.com/products/api-gl-4-multi-purpose-gear-oil-1-gal-SL24239.html
All of the Camaro guys he knows use this stuff and it works well for them. It's available on eBay.
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on 5/4/2018, 1:15 pm, in reply to "