Which statement regarding a worn rear transmission bearing is correct?

When discussing a worn rear transmission bearing, it's important to understand the characteristics of how it behaves under different conditions. Typically, when the clutch is disengaged, the engine's power is no longer transmitted to the transmission, which can indeed minimize or eliminate noise created by internal transmission components, including bearings. Consequently, any grinding or whining noises associated with a worn rear bearing may not be audible in this state.

Similarly, when a vehicle is coasting in neutral, the transmission is free from the engine's drive load, which again tends to reduce the sound from bearing wear. This state allows for the internals to spin without added stress from the engine, so the sound may also be less prominent, if not silent.

Understanding these dynamics helps clarify why the correct answer encompasses both scenarios. Worn transmission bearings may not produce noticeable noise when the load is removed from the system, as in the cases of disengaging the clutch or coasting in neutral.