Farmall H axle housing

kmh1224

New User
I"m replacing the axle carrier gaskets and seals on a Farmall H. I noticed a hole in the housing that looked like an imperfection in the casting. I looked at another housing I have and that one has it too. Anyone know if this is an imperfection, or maybe an oil passage or something else?
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If it is on the bottom of the housing it is a drain to let oil that gets past the bearing to drain back to the transmission housing. My W-4 has such holes except that they look more like intentional openings.
 

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