afennell said:
Do the difs often fail or need replacing, and what would be the signs?
I didn't notice anything wrong with my first diff. No clunking, no whining, nothing. But the dealer that it was in for an Inspection 2 said they'd noticed it was noisy and would I mind if they changed it - so as I knew it was under warranty (0 excess, comprehensive) I told them to fill their boots.
My 2nd was was whining as soon as I got it back from the accident repair in March. Immediately pointed it out to the bodyshop (who didn't give a

) and then I spent a few weeks going back & forth with the insurer/engineer to discuss why I believed it was the accident that caused it.
Finally believed me that the diff must have taken some impact during the accident, as it was fine for the Inspection 2 a few weeks previously, fine on a track day the following week, and fine during the MOT the week before the accident.