Here's a rundown.

I've heard the high AW oils are not compatible with yellow metals, but see them used in standard transmissions with brass synchronizers and no problems.
Oil Specs
 
It's not quite an answer to your question, but this wikipedia article on gear oil is pretty good.

https://en.wikipedia.org/wiki/Gear_oil

I run a GL-5 in my tractors and haven't had any issues. GL-4 would likely serve just as well. If there was a lot of copper and brass in the transmission, a GL-1 would be the way to go, but I've never personally heard of anybody needing to go that way.
 

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