Ok so I am not the best mechanic and have had a couple people look/try to fix an issue I am having. I purchased a 1959 ford fairlane custom 3 on the tree 6 cyl engine 4 link and air ride all the way around. When i purchased it, it had a horrible shake when taking off in first and in reverse rattles the whole car. the man i purchased it from said he replaced the clutch but did not replace the pilot bearing and said that is why it does it I figured easy enough SO the mechanic at my shop replaced the pilot bearing and put everything back together and still does it. We also put the vehicle on the lift to take the load off and put it in gear still would shake. Spoke to a transmission guy he said remove the drive line put it back up on the lift if it shakes it is from the trans forward if it does not it is drive line back mechanic did remove the drive line and there was no more shake. So he adjusted the drive line thinking it was maybe binding and also changed the u joints still no change. We also checked the bushings on the 4 link little worn but dont look that bad. Checked the rear end yoke and has very little play. Any help would be great... hopefully I described everything ok.