Lower unit has noise when boat is in gear. The faster you go the faster and louder the noise gets. It is a clank noise. If you turn the prop when motor is off and in neutral it will make the sound then. Took off lower unit and removed prop. The noise occures when you turn the shaft that the prop was on. Can anyone tell me what the noise can be. Sounds like a bearing, but I do not know which one it could be. Motor is a 1980 Chrysler Charger 115.