I have the car up on axle stands as high as I can get the cheap trolley jack to go. Even more cleaning now, as I try and get the underseal and dirt off the bottom of the car to check that there’s no rust or surprises.The axle looked in a sorry state, and there was very old oil that had leaked from the front of it. There was no oil on the floor underneath it in the garage, so It was either out of oil, or wasn’t leaking that quickly. The gasket looked like it had come out, and it needed a clean so pull it out, clean it and check it I thought. I thought about it for a while, then undid the shocks and hangers. Right. Lift it out over the springs now. I never really thought how heavy it would be. I had to lift it sideways by hand, and then jacked it up in the centre. It didn’t slide easily on the jack, and I gave up and used the engine hoist to pull it out the rest of the way. I put it on the floor, balanced it up, and lifted it diff down to look at it. The gasket turned out to be silicone that had been run round the edge. I gave it a quick clean off with white spirit, and left it hang overnight. Next day there was a puddle of oil that was like gloss paint on the floor. Rebuild it then. Or swap it for something beefier. Hmmm.