We have solved the elusive vibration! I was under my dads car (Jimdbrr), looking for points of contact when I noticed something wasn't quite right, like maybe the transmission was only being held onto the engine by the starter bolts!
So, appartently when his mechanic put the engine back in the car, he forgot, or just hand tightened most of the bolts. Needless to say, the with the addition of several bolts, the vibration is gone. Had I not seen the bolt holes, I never would have thought of that.
