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The oil is definitely gear oil not ATF.I'm doing a rebuild on the box so all the o rings and seals will be replaced.My question was did the gearbox designer not put in a drain/vent simply because he forgot rather than based on reasoning?
You can drill a hole anywhere next to the web on the bottom in the clutch basket housing, it's not that critical.I drilled and tapped a 6mm hole in mine, not that it needs a thread to be honest.