So this sound has been in my car (99 Accord EX 4cyl) ever since I bought it used which is over 5k miles ago almost a year now...

Anyway you can hear it only in park, in neutral, and sometime when your about to stop when it changes gears...so yes it is an automatic trans. And I just noticed that it is getting louder (you can hear it inside the car and out side the car and it is not a faint sound anymore) and it almost sounds like a bad washing machine or something but with medal being washed instead of clothes lol...

So I put my cell phone up to the transmission were the sound seems to be very loud and I recorded it for yawl to an MP3 so it sounds like what you hear in the attached file below.

Tell me what yawl think or if you have come across this sound and fixed it because I much rather fix it myself...

Thanks,
Steven.