Classic/Antique Car Repair: 1940 Ford noise in clutch or trans, input shaft, throwout bearing

Question
Restoring a 1940 Ford (stock) and started and ran for the first time since overhaul on engine. New clutch, new pressure plate and new throw out bearing. I engage the clutch and as I put it into gear (all 3) it makes a loud noise and the noise stops when I release the clutch. It is not a grinding noise and it goes into gear nicely. It's been some time since I've been involved in an flathead and it trans. I thought that it might be the throwout bearing but it's been so long since I've hear a bad one that I'm not sure, and of course it's new. Any thought on this would really be appreciated. Is it possible that being new that it could stop after some use?
Thank You Very Much,
Charlie

Answer
It sounds very much like the pilot bearing or bushing is screaming at you. This is the bearing in the end of the crankshaft that the front of the input shaft of transmission is inserted in. When the engine is running and the clutch is pushed in with the car in gear, the front shaft of the transmission is not turning but the crankshaft is. With the car in neutral the front shaft will turn with the crankshaft. I don't think that it will go away. Sorry to say that the cure is to remove either the engine or transmission. Make sure that the bushing is lubricated.