UPDATE - was 93 YJ vibration problem

Thanks for the tips guys,,,,, turns out the best tip was from a guy at work:
His recommendation was to replace the u-joints on the drive shaft, even
though they appear to be solid sometimes you'll get one bearing cap that
goes bad and it is enough to set off vibration.

Replaced both U-joints yesterday,,, vibration is gone today! And sure enough
there was one bearing cap with half the needles chewed up.

thanks again