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Make sure your vent is working properly. If it's not, the pressure will build up and blow it out a seal..... Make sure you don't have a solid bolt where the vent bolt is supposed to go. I did that once and learned ...




I totally agree. I had the very same problem with a 9 1/4 rear in my 4X4. It drove me nuts. I replaced the seals several times and even replaced the axle trying to find the problem. I finally found the rear vent had been replaced, by the previous owner, with a bolt. I don't know how I didn't notice it before I did. The strange part was it only leaked on the drivers side. Once I replaced the bolt with the correct vent the problem was fixed for good. That was a first for me but I've never forgotten it. It's worth looking to see if your vent is plugged or if it's even there at all. Good Luck.