Hi, I'm getting a whine from the rear diff on run down so looks like it needs replacing according to the garage. The garage (a decent Audi indy) have told me a new one is £2-3k apparently from Audi. They are more than happy to fit one but obviously wont source used parts. Where is the best place to look and how can I ensure I don't get my trousers pulled down or end up with a mechanical lemon of a diff?
Thanks
Thanks