8 3/4 spitting gear oil out of breather vent

George Jets said

If it's a Sure-grip, how much friction modifier did you put in on top of the 2 quarts of 80w90 gear lube? (making it over full...)

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One of the Red Line gear oil already has modifier in it. I remember reading somewhere if you use the Ford modifier it’s like 1/2 ounce.