Andrew i'm curious on your transmission / yoke issues... i have the same 6 speed
i remember when i installed it i had to shorten the yoke, a stock length one won't go in allthe way cause it hits the speedo gear as you've shown. the directions from richmond say how much to cut off. i remember doing this with a sawzall!
anyway, do you know if the yoke you have has been shortened? maybe you don't need a whole new driveshaft to get a "longer" yoke?
i'd never thought of this as a source of vibrations, and i'm glad you're sharing all you're finding. my car vibrated ~80mph... but there were alot of other 'deficiencies' for sure.
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