My 2003 Passat B5 TDI with 6-speed gearbox is making a buzzing/whining(?) noise while driving and it appears as if it comes from under the gear shifter.
The noise is:
- Dependent on road speed (more audible between 60 kph and 120 kph)
- Not dependent on engine speed
- Also audible when gear is in neutral
- Not dependent on clutch being pressed or not
When accelerating, the noise is there but less audible (probably because the noise of the engine masks it). It is much more audible in neutral or in 4/5/6th gear while decelerating.
Also, when the car is in 4/5/6th gear if I gently press the gear knob up (in 5th) or down (in 4/6th), the noise gets worse.
You can hear the noise in this audio file: http://goo.gl/qXX8x1
Could someone help me diagnosing where the noise is coming from?
I'm ruling out clutch and gearbox because happens in neutral and is not dependent on engine speed. Is this correct?
Could it be the differential? Could it be the U-Joint? Drive shafts?