U-Joint between the transmission and upper prop shaft, right behind the shaft brake if you have such a contraption.
NAPA part number 369 $12.99. NAPA has a sliding chart that uses cross width with caps removed and bearing cap size and type to determine replacement.
The old one which only had about 15 degrees of movement in one plane but full movement on the other was probably a significant source of vibration judging from the fact that the roller bearings had eaten into the races. The picture is with the bearing caps removed. The race to the right had no roller bearings left at all.
I added the part to the V-Drive parts list and attached.
Funny what you'll take pictures of as you get older.
Chuck
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