Dana 44 oil capacity

[Blazerowner]

So I installed a TA performance diff cover and am wondering about the oil level. Per their instructions I filled it until it slightly ran out of the fill hole on the cover. I seem to have a small leak from the yoke. Very slight, just a few drops. I don’t know if the fill hole is the same height as stock and it took about 2 1/2 quarts. Per them it has 1/2 quart extra capacity. What do you all think? Is it too full? Why would I have a slight leak in the yoke. This a rebuilt unit by a reputable shop. Is it normal to have this leak a little when the seals are new?