I havent looked at it yet as it is not a daily driver and I have not had time. (too busy at work) I do intend on making 100% sure before I purchase anything. It is not a vibration as much as it is a growling noise that sounds like it is coming from right under the shift lever between the front seats, which is precisely where the center support bearing is. The only decision that I have made thus far is that if I have to purchase an entire drive shaft, which I dont believe that I do, is will be from a bone yard, not from Ford. My drive shaft has a big nut holding the yoke (Just a miniature version of the 1946 Ford truck parked in my barn) and it looks like the center bearing is pressed on the shaft. It sure doesnt look non serviceable to me.