Another 8,000 miles later and thought I should check the splines again just to see how things look in there. Well, the lube held up pretty well. I could have probably waited another 4,000 miles for just that, but there was
a lot of dirt in the surrounding area. There is a drain hole in the bottom of the drive shaft swing arm where I guess crap comes in. Anyway, I highly recommend folks lube those splines on a somewhat regular basis.
Also, just a warning that lining the final drive up with the shaft is a complete b1tch, especially if you're working alone. The male end must be oriented precisely straight with the spring balanced inside the short hole that holds it. The final drive must line up with the shaft, spring has to stay balanced in place and then the four bolts that hold it all together must also line up with the holes in the swing arm. The final drive is heavy and very awkwardly balanced. But all ended well and it came together perfectly.... probably at about the 40 minute mark with a great deal of swearing thrown in! There's nothing like that feeling though when it does slip in....