I have a 2002 1800 with 98000 miles on the odometer. The tech at my dealership showed me the oil from my final drive. There were metal shavings (micro) in the oil. the tech said he changed the oil and that I should it for a 500 mile ride. If there is still metal in the drive oil after that, he will open it up and see what is going on. I took a 300 mile ride and brought it back. I told him to open it u and at the minimum " change the drive gear and the gear from the drive shaft." I guess if I am going to take a heavy hit, should I add onto it by changing the alternator? I am planning a few long trips this summer. I don't need that final drive problem weighing on my mind. So what do you think of throwing in a new alternator?