Odd sound when idling in gear
 

When I stop at a light or something and have my foot on the brake while it's in gear, there's a horrible vibration/almost grinding sound coming from under the shifter, dash area. From the outside of the car or under the hood I can't hear anything. Also when I shift from neutral to drive the car violently jerks forward. Any ideas what might be causing this?

No thoughts?

converter bolts tight?

any other issues? does the jolt happen from park to gear?

when you go from N to D and vice versa, whats the RPM difference...does the idle jump when you go from D to N or from D to P?

Any transmission codes? (MIL light will not illuminate)

Is your exhaust rattling on anything? maybe the two problems are unrelated

when did the problem start (honestly, don't say it JUST started)

Old thread but I'm having a very similar problem. I have a 2000 TA with an A4. When I slow to a stop while the car is in gear I hear a grinding sound coming from the car. If I keep the car in place by leaving it in gear and keeping my foot on the brake the sound continues but if I push it into neutral the sound goes away. If I put it in park the sound goes away. If I put it into reverse the sound comes back. At faster speeds, +25 mph, the sound goes away. The sound did not start suddenly, at first it was subtle and only happened a few times but now it is very frequent, happens at every stoplight.I have not noticed the violent jerking movement that the op mentioned. Skopers3 did you ever find out what was wrong with the car? Does anyone else have any other thoughts? TIA.