[3essess]

First off, love the way the car drives except for this one "grinding" or "rattling - gear grinding type" sound that happens exactly as you described and in your vid.
It sort of sound like the sound made when you're trying to put your car into gear without using the clutch. After driving for over 1000 miles, I can usually make this sound happen under the following conditions:

1) When slowing down for a stop or turn, put your car into neutral - so your coasting down.

2) When slowing down in neutral, the revs will usually settle in around 1000 rpm or so until you get down to below 25mph or slower. Then the revs will finally settle in to 700 or so...then the revs will bounce down lower to 550 to or 650 rpm and that is when I hear the rattling sound.

3) Like you, I also can make the rattling stop if I push in the clutch, or, if I bring the revs up via the throttle - the sound goes away. Or, if I do nothing, it will slowly stop in about 2 or 3 or 4 seconds - once the engine revs recovers.

4) No matter how hard I try to duplicate the sound with the car NOT moving, it will not happen. The car needs to be moving in neutral to make the sound come out.

5) To me, it sounds like something in the transmission is rattling, whether gears or rods or whatever. Could it be the motor knocking at that low rpm - I hope not.

We gotta get this resolved...

Thanks.