I have a slight vibration over 70mph. I had so many problems with vibrations since I went to the 700R I'm afraid to touch anything at this point. What I must say is that Ed and Tom were exactly right from the very beginning. It all had to do with the phasing. None of the drive shaft companies would believe me so I've been thrown out of every drive shaft shop in South West FL. I really don't have anywhere else to go at this point, but like I said it so much better then it ever was I'm just trying to live with it. Also I have been diagnosed with lung cancer so I really don't have the time or strength to deal with it right now. Its just too much trying to put it up on stands and pull the shaft in and out. I must have done that 50 times in the past. Maybe some day if I can beat this I would like to pull the rear half of the shaft just to see if I could still feel it if I run it up over 70mph. You know to determine if its the front shaft or the rear that's causing it. Most of my driving back and forth to shows is on Rt 75 so if your not doing 70 to 80 you had better stay off the highway. Also with the 373 Posi and the 700r4 if you not doing at least 70 your not turning at least 2K.
Best....