Good morning everyone, I am at the Myrtle Beach Run to the Sun car show but with no car unfortunately. Ok I am going to try to respond to all three posts above in one reply. We have tried the drive shaft coming straight in line with the tail shaft, from there we have added shims from none at all, all way thru as many as the bolt length on the banana link will accommodate, no change at all which is crazy, I think it at least should get worse but it does not, stays exactly the same that's why I am wondering if I am in the wrong ballpark. The suggestion of adding 100 pounds I can easily do as soon as I get home. The suggestion of holding the brake and trying to duplicate the shutter we have tried to do without success. The 60 MPH vibration is easy to duplicate but can not really tell where it is originating. I have put my hands on everything while it was going 60 and nothing definitive. You can still feel it in the seat while doing this but I have sat under the car at 60 and basically learned nothing. The shutter is different we do not seem to be able to duplicate that on the lift. Holding the brake, from dead stop to a slow roll then hit the gas it just does not duplicate. In my earlier post I stated this but I will reiterate for clarity, I have had 3 drives shafts balanced and installed including the slip joint with poly CB, it was worst of all. I made a lower CB, no help. We have set all angles to the limits of the adjustment. On everything done, I have not changed the issue by more than one point on a scale of 1 -10. We have put on 4 sets of different tires and I have tried every idea suggested in this thread and will continue to do so because someone will suggest something I have not tried and it will be fixed. I hope no one thinks I am blowing off their suggestion because I take every one seriously. Some I have just done 10 times and some others I have never even thought of. Its a nice car that I cant drive, very frustrating . I am considering a one piece drive shaft and have read every thread on this site but only a very few state their success on this, I would like to hear more, fabrication roadblocks, drive shaft size and especially about results, good or bad. How good or bad? I have spent a ton of money on just this one vibration issue, 3 drive shafts, balancing, several new sets of u joints, two drive line shops evaluating the issue, etc. I need all the help I can get and appreciate everyone's effort. I did buy a new on car adjustable banana link and will install that on my return, the only advantage there is a slight more amount of adjustability. thanks guys..