Just took my 98 Dakota in for a standard oil change. The dealer called to recommend we have them change the differential fluid (it has the limited slip differential). We always do what they recommend since be bought it new 10 years ago. On the way home (5 miles later) I hear terrible noises from the rear of the car, grinding and popping. I have it towed back to the dealer. They now say it seized up and it needs new clutches. $700+ labor and $400+ parts and they want us to pay the parts. It only has 75K miles and is never used for heavy use (no towing). I told them no way this could be a coincidence and that they must have caused it when replacing the fluid. There were no symptoms before taking it in for the oil change. They say they put in the proper TWO types of lubricant, and that the machine used to remove and replace the lubricant couldn't have caused it to happen.
Any experience or advice?