Was the new yoke the same length as the old one? Your vibration sounds drive shaft related. Make sure the new u joint is "free" and doesn't bind. Also try turning the drive shaft 180 on the rear yoke. If that doesn't work, I would send it off to get it checked for balance like others have suggested. John
1970 Land Cruiser, 351w, NP435
(locked up front and rear)
1965 Galaxie, 428, C6, 3.89 gear,
Detroit locker
1979 Spectra Day Cruiser
stock 350ci Brand X, Mercruiser..53mph on GPS
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