MY 1985 Nissan Bluebird station wagon seems to have drive-train vibration. It has a two-piece shaft with a rubber mounted bearing in the middle. Try as I might after changing the bearing and replacing universal joints, I can't get the vibration out. I've tried various positions on the splines, but don't want to go to the expense of balancing because I've spent too much already.
THE problem may not be with the tail shaft. Have you had your wheels and tyres balanced? Try swapping the front wheels to the back and vice versa. Also check the transmission path the vibration follows to get to where you feel it. There are many components in the path -- suspension bushings, body seals -- that can dampen the vibration and all these should be checked for damage. Also check the alignment of the shaft, and ensure the drive-line angles are within specification.
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