The following problem with my XC70: If the car starts at 120kmh quickly uphill you notice an unpleasant vibration from the area of the rear axle. As soon as the car goes downhill or flat, the rumbling is gone. The following things could cause the behaviour: Old oil in the rear axle differential Defects Haldex coupling Porous Haldex disc (made of hard rubber) dampens the vibrations. Defects bearings in the AOC (interax differential) Evident defects wheel bearings at the rear (but can be excluded) Does anyone know this behavior? It occurs mainly in partial load operation – hardly is it quiet from the gas. Achja’s running performance is currently at 290000km. Year of manufacture is 12/2011 with the 215 hp D5 machine. Thanks