If your axle seals are leaking that has to do with the tranny/rear end oil, not the final drives. You have to spin the wheels all the way out on the WD to get those pans on the final drives down and the inside bolts are still a pain. I just did mine and use 80/120 gear oil in them. Got new gaskets from AGCO but kind of pricy at about $12 a side! Would think permatex would be fine as this lub is not under pressure of any kind.