There was a TSB on the 05-09 axle assemblies concerning the breather tube, nothing yet for the 11-13 models, so I imagine they fixed it. Mine leaked when I first got it and I haven't noticed any new signs of dripping. If you want it "fixed" for peace of mind you can buy this bulb thing. Another alternative is to make your own vent tube that is longer so the fluid can't get out due to gravity and the gas can still escape. There are numerous ways to do this, if you're unsure just google rear axle vent images and you'll find something.