Subject: Loud whine from gearbox on overrun?

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Chaps, the gearbox in my 16/80 recently started making a loud whine when easing off the throttle. It sounds as it always has done when accelerating or under power but the instant I lift off or coast it whines. It has certainly become loud enough for me think it’s not normal.

Any thoughts on what may be causing this?

Thanks Rich...