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My 1980 had the kind of drive shaft you're describing. The rear half is actually two nested lengths coupled by a rubber sleeve. Supposed to reduce drive line noise.
but the rubber gradually shrinks with age. Mine didn't rotate but it developed a shudder that couldn't be eliminated because the two parts would get a bit out of line whenever you torqued it up.
Eventually I ditched the rear half for a "plain" unit. I also had the entire thing rebalanced. It was then ok except that the spline connection was a little loose between the original front half and the substitute rear half, so it STILL had just a wee bit of shudder.
I swapped only the rear because it was EZ off--EZ on. If I had it to do over I would have swapped out the entire unit.
Good luck.
Doug Harvey
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