We have a 2010 XC60 D5 AWD Manual, roughly 70k miles. There is a drone from the rear that starts at 50mph. At first I thought it was a failing wheel bearing but it doesn't get louder with increased speed but does get change slightly with more power.
The local dealer had a look and diagnosed a problem with the rear drive. They have quoted £5k to change the primary and secondary "final drive units". After picking myself off the showroom floor, I thought I'd do some research.
What has really surprised me is that there is barely a mention on the internet of an XC60 AWD rear drive failing. You can usually find discussion about any fault on any car somewhere so clearly this one is not a common fault. There's just one other thread on this forum =>
http://www.volvoforums.org.uk/showthread.php?t=221154
Does anyone know anything about how these units fail? Is it reasonable to change both units or is the dealer just doing a blind replacement instead of identifying the cause of the problem?
ps We've not had any warning messages about AWD.