Bad Driveshaft?
 

I have an 02 3.0 quattro and recently noticed a thumping noise which is present at all speeds but worse at lower speeds, like under 40mph. At first I though that it might be the driveshaft but there is no vibration whatsoever, just a weird thump thump thump noise comming form the back of my car. If anyone has an idea let me know.