My 2003 HSV Maloo R8 has developed a loud grinding and clunking from what I believe is the diff. I have been to three dealerships on five separate occasions and all have stated that it is the LSD and nothing to worry about, and one tried to charge me for tightening the spare wheel that he said was causing the clunk. It wasn't. What can I do?
If it's a grinding noise like metal on metal as you first describe I would change the oil in the diff; it it's a clunk as you also say then I would be seeking advice from a diff specialist. There are specialists in all states and most will be familiar with the diff problems in most cars, and will have fixes for them.