Transmission whine / low level vibration

I have a gen 6 with 30k on the clock. Bought it a couple years ago with 12k from meticulous first owner. Alway had maintance snd tlc. Recently there is drive train noise and low level vibration under load that's getting worse slowly. Much more noticeable at speed and amount of load doesn't seem to matter but if I pull clutch in and coast goes away. Indepedsnt of engine revs snd gear. Chsin and sprockets are about 6 months old and 1000 miles on them. ( did same with old set)

Output shaft bearing? Could it be the transmission has a bearing failing? Seems crazy with only 30k on the clock.

 

Thats a tough one to say since you pull in the clutch and it goes away you're taking the load off the gear box, smh IDK without seeing it first hand, but sounds like it's in the transmission as odd and rare as that is. maybe others here will chime in.