I took a 14bff out of a 1008 (I believe) hardly any wear on anything showed 6600 miles and looks about right by the wear. Anyway I put a disc brake conversion on it and changed the hub seals since the kit supplied new ones. After a couple of miles I had oil running down my tires. I did check the part numbers at that point and they were different but once a crossover was done on the numbers it was the correct replacement. Changed the seals again and they held a day or two and that was it. The vent tube is not clogged, there is not up down/side to side play in the axle, housing not worn and hub is tight. Have litterly replaced hundreds of these over the year (other axles mainly) what the hell am I missing?????