8 3/4 venting oil from the vent. seems odd.

Oil has come out of my 8 3/4 breather since I swapped the BBP unit into the car. I've changed center sections, axles, bearings and it's puked oil all around the area. I may be overfilling, as I filled until it dripped out. I've tried putting a small piece of scotchbrite pad in there to no avail. I'll add a length of tube and a small filter after reading that above.