Transmission noise (with video file)

[patssle]

My 2000 S has a noise coming from the transmission in idle - sounds like a rattle noise. It's random and doesn't happen all the time. When I push in the clutch it goes away. I put a wood stick on the rear of the transmission case and listen through it and it sure sounds like the transmission is the source. Here is a video where I also put the camera on the stick to adsorb the vibration noise. Any thoughts?

Thanks!

https://www.youtube.com/watch?v=I85tIVwc89Q&feature=youtu.be

[Mig]

if it was my car, I would find a quiet road, bring the car up to speed, put it in neutral, turn off the engine, and see how it sounds at speed with the engine off.

Yes, I realize this can be considered risky driving, but the test could tell you if the noise is independent of the engine.

[epapp]

Does the sound change when you are moving and have the clutch in/out?

It sure sounds like a single cylinder or valve/lifter assembly knocking because of its frequency at idle.