Hi everyone,
2004 XC70, 190K:
1) All F/R wheel bearings are newer (1-1.5 years old)
2) Transmission oil is 3 years old

When I go around 40, 60, or up the hill (try to accelerate without kicking down to lower gear), I hear this drowning noise. It's become louder since I noticed first time in this spring. Since all my wheel bearings are newer (and I remember the noise), I suspect the problem is somewhere in my differential.

Do you have any ideas? Or the same experience?

Please advise.

Thank you!