A manual transmission or final drive assembly is usually considered full when which condition occurs?

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The level is considered full when oil begins to dribble out of the fill hole. The fill hole serves as the reference point for the correct capacity in a manual transmission or final drive, since these housings typically have no dipstick. When oil starts to flow out, it confirms the cavity is filled to its proper level and any more oil would overflow. Filling to a point just at the hole without overflow isn’t as reliable, and simply draining and refilling without confirming overflow doesn’t guarantee the correct level.