vibration at 70 and over

A couple things you haven,t mentioned?Motor mounts?tranny mount?Could be the bearings in your rearend?Warped rotors,drums?Have you had the brakes done?Could be a number of things.Also how much mileage on the car?You,ve gone over alot already,just trying to help.

P.S Who,s doing all this rework?d.shaft 3X and 2 convertors?