Hello, I hear some bad sound from rear side my car, but only when I start moving from 0km/h and steering wheel is fully left or right. When I start moving forward there is no bad sound. I hope that will be rear wheel bearings, but my friends said it will be differential. What do you think? I will go to my mechanic next week. Is it possible replace audi S3 1999 210hp rear differential by audi TT 2002 225hp differential? Are they same? Thank you.