Don't pry at the seals with a screw driver, the smallest scratch in the diamter/hole that the seals go in will cause an airleak. Your supposed to put screws in the old seals 180' apart from eachother and pull the screws evenly with pliars or what not. Also just because oils coming out of the vent tube that doesny mean your seals are bad ... You probably have too much tranny oil in the transmission/bottom end. I would check that first being that draining and refilling your trans oil takes leas than 5 minutes, replacing the oil seals takes much longer.