The attached sound file is a recording of the noise emanating from my gearbox. 1973 TR6 with J type O/D.  I have owned the car since 1979.  Taken off the road in 1982.  68K miles. The clutch and plate are 700 miles old.  The thrust bearing squeals slightly and will probably need changing but I don’t suspect that it’s the thrust bearing which is causing this particular noise; however, I’m open to your opinion. The noise is progressively getting worse, hardly noticeable 400 miles ago. Th