I would think there should be another plug somewhere on the axle where the anticipated oil level should be, you know, like on a truck transmission, so that if you were to overfill, you could remove that plug to drain the excess out, down to the plug which would be at the correct oil level. Am I making sense?
You certainly don't want to overfill it, as that will blow the seal out when the oil got warm. Outside of that, I would first advise you to locate an owners manual, and if no, then I would put in enough oil to make sure that all moving parts are getting oil.
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