Output shaft seal. Once you take the driveshaft off, use a hammer and a chisel to carefully remove the old seal. If you
don't have acsess to the proper install tool, a large socket
with the same diameter of the outside wall of the new seal
will work just fine. Pound on the socket squarely to get it
seated straight, or you could bend the seal and have to buy
a new one.
After you remove the seal, clean the surface really well with alcohol, paint thinner, brake cleaner, etc. Appl a small smear of your favorite silicone sealant to the outside of the seal. Then install as above.
Seals often leak because they wear a groove in the sealing surface. The harmonic balancer does it all the time. The drive shaft not so often because it moves. But check that. If there's a groove you can feel with your thumbnail, it will wear out the new seal fairly quickly.
Just like the balancer, you can buy a thin metal repair sleeve. Glue it on with some silicone and you'll be leak free for another 50K miles.
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