Vibration issues

I finally solved my vibration issue. Installed a new driveshaft, u-joints, slip yoke - all balanced as a unit. The slip yoke used to have 2+" of its shaft exposed out of the tail of the transmission. My research let me to the decision that there should me more like 1" to 1-1/4" exposed so I ordered the new driveshaft an inch longer. Car is smooth at all speeds now!
-now on to the next project... figuring out how to rebuild my trw power steering pump :)