The center bearing looks pretty bad. The rubber part surrounding the bearing has separated from the bearing holder. Not sure how long, but the exposed metal part of the holder has a good deal of rust. The bearing itself seems to roll a bit rough as well. The whole thing appears to spin freely inside the holder.
How much support does the bearing holder give to the drive shaft? The old rubber bearing holder did not seem too thick although 20 years may have gotten the best of it.