Changed the rear differential oils to OEM (Hypoid G1) and the noise got lowered a bit. Still you can hear it between 50-65mph. It requires something like 30miles drive before you can really hear the whistling noise.



Is this a common issue with E70's? Are there some bearing sets on sold to fix the old rear differential? Any tips where to get them without paying a fortune?



The OEM number for the rear differential seems to be 33107590914.



The rear wheel bearing couldn't cause this kind of noise symptoms? At least on this point there's no difference to noise depending if you are turning the wheels to the one direction or another. Main thing is the foot release from the accelerator pedal.