hard shifting 833

Ace said

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.

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GL-5 lubricant can be and some specify that it be used in a transmission, here is a link to Valvoline gear oils.
http://www.valvoline.co.nz/prod0111.htm

But this isn't really the issue. The factory manuals recommended ATF years ago and the gear boxes haven't evolved into some other kind of tranny they are still the same trannys as when the manuals were written.


Chuck