Hi
I have a knocking sound from the back of my e46 320d. i think its the diff bushing but cant tell. i took a video of me moving it with a spanner.

Does it look worn out to you?

https://www.youtube.com/watch?v=VYvZ...m-upload_owner

heres a video from underneath rocking the car back and forth
https://www.youtube.com/watch?v=uZejaaoGMWw&feature=em-upload_owner