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Thanks for the info about a source for obsolete parts. That is very good to know.
If I was the OP I'd figure out what's wrong first. I had two leaking seals on my 2000, the rear diff pinion seal and the engine rear main, with only about 130,000 miles on them. The seals do harden and leak with just time and heat cycles. Might find that a simple seal replacement is all that's needed.
Looks like a guy on his back under the truck could easily just reach up and give the shaft a shake and know if the bearing is loose. Also looks pretty easy to put back together with the bad parts if it turns out a housing is needed. Might be time to take some action.
p.s. honestly, I'm just curious about the extent of the damage at this point. Looking back at the posts, it could be just a leaking valve cover gasket. Can't tell.
Glad to help. Just for reference though, Vintage does sell (most but not all of their parts) to the general public but the pricing structure is of course different to dealers so we can frequently sell you guys those parts for less than Vintage lists them for on the public side of their site.