I did a search for this and nothing came up other than buying a new Ford Racing cover. I don't believe that should be necessary. When I sealed it last time I had the diff out on my bench cleaned it with brake cleaner on till it was spotless and sealed it with Motorcraft heavy duty silicone and let it cure overnight. It was good for 2 years and now it's seeping out between the cover, not the vent or output seals. If anyone has a fix I would like to try it. Thanks in advance for your help.