I have a Civic DX 1995 with 177000mi. I’m having a problem with a lot of rattling noise that, I suspect, is coming from transmission. When I bought this car (with 155000mi) the noise was present and I took it to a mechanic that the car will be fixed. Mechanic was suspecting that the throw-out bearing is worn out. He changed the clutch, throw-out bearing and also resurfaced the fly-wheel. I saw the old throw-out bearing and it was worn out.
But when I test drove the car the car was still making the rattling noise.

The noise is NOT present when:
- the clutch is disengaged and a clutch pedal is pressed in.

The noise is present when:
- the clutch is engaged and car is accelerating or deaccelerating
- the clutch is engaged and the transmission is in neutral


- When I start the car with the clutch pedal pressed in and the transmission is in neutral or in one of the gears there is no noise.
- When the transmission is still in neutral and the clutch pedal is released then the noise (not much of rattling) becomes present.
- When I start driving in first gear, there is not much noise but when the car rich mid- and higher RPMs it rattles a lot. The rattling is then present in all gears, no matter how high or low the RPMs are. It’s rattling the most when the car is accelerating or when it’s deaccelerating.
- When I drive in 3rd gear and then press the clutch and put in neutral it still rattles and it sounds like that the rattling sound is slowing down. If then, while clutch is still pressed, I put in second gear then the speed of rattling increases. And then when I release the clutch the rattling gets much louder.

Rattling is always consistent with the RPMs and is not changing with the speed of the car.

Does anyone have any idea what it could be wrong?

Thank you very much for all the answers.
PT