Drone noise & mild vib frm mid-rear @ hiwayspeed. Chgd drv shaft assy & frt brgs

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Sound varies directly w/ speed,exactly. Never services PTU lube, have 106K miles. Noise is getting louder, is not tire noise. Too loud for a luxury name vehicle! Changing both rear bearings today with concern for this being final fix. I drive approx 600 miles per week. No Leaks at rear observed. Thanks.