Bearing Noise

Gear rollover noise, inherent in manual transmissions, (caused by the constant mesh gears turning at engine idle speed while the clutch is engaged and the transmission is in NEUTRAL) and clutch release hub and bearing noise are sometimes mistaken for mainshaft bearing noise.
^ Noise caused by a worn or damaged clutch release hub and bearing will be loudest when the clutch is held disengaged.
^ Gear rollover noise will disappear when the clutch is disengaged or when the transmission is engaged in gear.
^ In the event that a transmission bearing is damaged, the noise is more pronounced while engaged in gear under load or coast conditions than in NEUTRAL. When concerns of this nature are encountered, it will be necessary to road test the vehicle to determine if bearing noise exists.
Under no circumstances should any transmission rework be attempted to eliminate gear rollover noise or clutch release hub and bearing noise.