hard shifting 833

Hypoid gears would require a GL-5 rated gear oil. Straightcut gears in a standard gearbox would want a GL-4. Bonus question: Why have GL-5 oils not traditionally been recommended for tranny gearboxes? Hint: It has to do with the synchros, and the situation is changing, even as we speak.

Let's let Krapy answer this one, to see if he really knows what he is talking about.