No vents. It has recently came to my attention that some peoples portal hubs blow seals from not being vented. I guess they say the gears heat up with the oil in there and i guess the air expands a bit a pops the seal out. Hasnt happened to mine. If it ever does i guess i will take the portal boxes apart and drill a tap a little vent hose in a good place on each one and thread in a little brass nipple and run hoses up the a-arms and run them up high like the other hoses. I dont knowDoes your portals have vents in them I know some don’t seems like they would need a vent