Some of us have had our service folks remove the rear drive shaft and found the vibration goes away. This would seem to mean that the rear drive shaft has a problem and that replacing it would solve the issue. While I do not see that anyone had removed Albert's drive shaft before, if indeed the drive shaft Kia brought with them was a good one, then perhaps the vibration may not be due to a bad drive shaft - rather to something bad that the drive shaft connects to. Good information may come from what the Kia folks test out on Wednesday.