It sounds like a transmission bearing to me.
To determine if it's the front half or rear half of the trans... get going down the road like 50 MPH and throw the trans into neutral and kill the engine. (Don't lock the steering wheel!)
Does the noise continue? Indicates a problem on the trans output side.
Does the noise stop? Indicates a problem on the trans input side.
Also, if the car is stationary, in neutral, clutch engaged, and it's noisy, that indicates the input side. What if it's parked in neutral, clutch engaged, and you rev the engine up and down? Does the noise increase/decrease with engine speed?
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Current rides: 2005 Volvo S80 2.5T, 2003 Volvo V70 2.4NA, 1973 Volvo 1800ES (getting ever closer to road worthiness)
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