MTF Comparisons?

Crap! I just Filled My New 4-Speed with Valvoline 75W-90 Gear Oil...
It say's it's for a Non-Synchronized Trans? What will I do now?? Drain it before I spin it?
or Send It and see what it does?

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I filled mine with 75-85 GL4. I was told not to used GL5 because it ruins the brass.