My driveshaft looked okay when I inspected it as well. I did see your bushing was trashed so that is a problem. If the clunk continues after that replacement, then you should try the driveshaft lube.
The "clunk" is your driveshaft. There are threads on it, you need to grease the driveshaft and the knuckles. The driveshaft needs to be over-greased to dampen the clunk.
I did the same thing you did...sold the 60 and bought my wife a 100. First thing I did was the timing belt and "T's". I would add timing belt if they were not done recently and the mileage applies. I also went to Trail Tailor and got their upper control arms and diff drop. You can keep the stock...