So, quick update - I fixed the problem...
It was a slipping splined linkage on the rear-most part of the rear U-Joint.
I first checked the trunion nut, but that was tight.
Then I found that there are not 2 U joints, but three - there is one you can partially access by removing the ashtray...
Luckily we were able to see the unwanted movement of the shaft / spline pretty easily. I didn't want to take my console apart!
Rocky
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