I can finally ask and answer that particular question. Yesterday on the way to church the answer became crystal clear. 281,503 miles of driving which includes changing differential fluid every 60,000 miles my differential decided that it no longer wanted to be a part of this world and went to wherever it is that differentials go to die. The car is barely driveable but the strong smell of fluid plus the smoke from the worn out differential tell me its time to shop for a replacement part. I found one with the help of the guys at Convenience Car Care for $425.00 and will be back on the road headed for 300,000 miles by the end of the week. Just my two and a half cents worth. Happy Motoring...