Driveline hum/noise - diagnosing? RESOLVED

[g300d]

Guys, what's a good procedure to diagnose driveline humming?

Accelerating up to 50, it starts to make a bit of noise. It's a muted humming that changes with acceleration and deceleration, becomes unoticeable below 40 or so.

Subjectively, the car does not "roll" on the road as smoothly as I would like.

No driveline vibration, it's more of noise.

Sound does not seem to vary when doing side to side transitions so it doesnt seem to be wheel bearings.

Any other checks to do to rule those out?

How about the diffs/propeller shafts, what's the best way to see if those are the problem?

X5 3.0 on staggered 19" sport package wheels and tires, tires are OE Bridgestone Turanzas.

RESOLVED: Rear wheel bearings