Tailshaft bushing removal/install

Fishing68 said

66fs- I am assuming if your slip yoke and tailshaft bushing were original then they are the same tolerance as the standard spec clearances. (Unless maybe the 904 has different set of clearance specs than the 727)
Again I am not a mechanic but I assume either transmissions have many things that can become tweaked/worn a bit and contribute to a vibration at 100 mph. Heck at that speed it could be something not related to the transmission at all.

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I've had more than a few A bodies, manual 4 speed and automatic 904 and 727, and all were driven at least to 100 mph out west, even a 170 cu in /6. The 273's up to 140 mph, just because. All with untouched trans yokes and bushings. I don't believe wear is as much a factor since we have had cars with a lot of serious miles on them. I doubt that the slip yoke and tailshaft bushing is a problem unless they are aftermarket and not to specifications, Chinese? I always had high speed rated tires balanced very well. The most probable suspect in my mind would be the drive shaft balance, if you can rule out tire balance. But I balance everything, including engine, flywheel, pressure plate, drive shaft, brake rotors and drums.