[Fot] Not so funny TR4 tranny noise

[toodamnfunky at comcast.net]

FoT,
My transmission had developed a high pitched whine but only in regular drive.
I could only hear it coasting in nuetral possibly in part to the exhaust noise
but when I engage the OD it goes away. The the volume and pitch are definetly
related to axle speed.
I use anB J type OD. It seems on the surface to be an overdrive issue but I'm
not assuming anything.
Any thoughts ?
Thanks as always for the input,
jim g.