I have a 2006 Hyundai, 5 door, Getz with the 1.6 lt motor and five speed gearbox, the problem is that about 80kms per hour the car develops a vibration you can feel it and hear it. It does not come through the steering and I have had the tyres checked and balanced. It is most noticeable when in fourth gear at 80kms, if you put it into fifth which reduces the engine revs the vibration is not as noticeable, then by the time you get to 100kms the vibration is gone. It is also noticeable when accelerating at lower speeds whilst in second and third gear whilst gaining momentum. Have you any suggestions on what it might be and what should I fix or replace first any suggestions would be greatly appreciated.