So i was going to replace my rear brake pads this morning. When i took the wheel off and was messing with the disk i noticed my caliper was moving around allot. I looked inside and behold my entire differential was moving up and down with the drive shaft while i manipulated the disk. I am pretty sure this is a serious issue. What would repair cost run about? i was quoted about 320$ from our local volvo scam artists...er...specialist.