I replaced just the outer seals on my SC about 3 years ago thinking I would "do it right" when I had time. They still don't leak and I'm not motivated to get it done.
I just replaced the 2 outer seals on my 200. The axles housings also leaked where it bolts to the trans housing. I removed all those nuts and slid the assembly out about 1/2". I then cleaned and scraped all the crud out, hit it with some brake cleaner and used silicone as a gasket. Sealed it up, no more leaks.
I know it's not "right" but it works and only takes a couple hours vs all day and then some removing the top cover.
Someday I'll tear them both down and do a restoration.