Thanks, hubcapsc!
My splines are definitely NOT "icky". They look just about exactly like what I can see from the "not icky!" pic. Very reassuring.
Guess I'll have to join a pic-hosting site to be able to post here. Thanks also for that info.
Keep looking, though, and make sure that both ends of your driveshaft are good. One end lands
at the universal joint, that needs to be good. The other end lands at your pinion cup, that needs to look
good.
Going all the way to look at your universal joint might turn out to be a big pain in the rear end,
so if the end of the drive shaft that lands inside the universal joint looks good, you might should
skip looking at the universal unless you can't find something else to blame your noise on...
the "joint" part of the universal could go bad (and make your noise) without the splined connection
between the shaft and the universal showing wear...
The universal joint, the final drive, and all the parts in between get a lot of attention on this
board, so when work lets out you might get a bunch of knowledgeable people chiming in on
this thread, and you can find a lot of relevant info by searching the site...
-Mike