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Aye--
I've had all the driveline problems except the tailshaft. I can think of two other possibilities.
1. If 1982 is like my 1980 (was), the rear half of the drive shaft is actually a tube concentric over a central shaft, with the two bonded by a rubber sleeve. They did it that way for (supposed) noise reduction. The sleeve gets dried out over the years and shrinks. This allows the two pieces to flex under load. Presto--vibration.
2. I thought I had this licked when I got a clean rear half driveshaft (no noise isolator) off a parts car. Oops. There was slop in the spline connection--still vibration.
I guessed that most of the vibration was because the two pieces weren't balanced as a unit. I had the whole thing rebalanced and it was close to 100%.
Even if you get an entire replacement shaft to avoid the spline issue, you've got to mark the alignment of the two pieces--you can have it assembled to match the pic in the manual, but one half will be 180 degrees out of phase which kills the balance.
AND--if anyone has previously vise-dimpled the shaft while replacing a u-joint, the shaft probably isn't in alignment any more. I suppose you could still balance it but it would take a lot of weight and the u-joint wouldn't turn quite true. I would reject any replacement shaft that had a dimple.
Good luck.
Doug Harvey
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