I have a drive shaft with about 30,000 miles. The mechanic told me I needed to replace the driveshaft (non audi mechanic), after I bought and replaced one, the shaking continued and it turns out the driveshaft was fine, it was a U joint. Anyways, about $1500 wasted to figure that out. My loss your gain. Make offer if you need one.

Email me at tjjolle@gmail.com if interested.