Back to my Super; when changing diff found rear u-joint sloppy, cup was spinning in the yoke. Took it to Driveline Service, as expected the yoke was the problem, not the cup. Alas, this driveshaft has been in the car for 20 years, very smooth all along. I have various others, took another to them, they were happy with it, put the new 24mm u-joint kits in, straightened and balanced with the front half, which got a new donut and rubber carrier. I did the nose bushing 15 years ago, shows no wear.
Seems every 105 sooner or later needs driveshaft work. This car had a good long run, hope it continues to. Note, 1600 had two sizes, one Italian at 24mm, another Hardy/Spicer, just under, probably an inch size since it's an odd mm size. I had shafts with both. Jon Norman has the 24mm kits, but Hardy/Spicer ones he says he can't get. The driveshaft shop said they can get new H/S yokes, but not Italian ones! Never the twain shall meet.