My '39 JD is leaking a little oil from the right axle/wheel assembly. The differential appears full. Oil appears to be moving from the transmission down the torque tube, and then out the wheel/axle. The only vent that I can see is on the torque tube, and I suppose it could be blocked. Is that vent threaded into the torque tube, and should I add a vent to the differential or rear axle housing??
