The rear end on my car is howling and I'm not sure if it is because the gears in it are rusty or worn too much. I did a visual and the teeth looked mostly intact, but those that were not in oil as it sat up had rusted. I cleaned them up and put it back together to see how it would sound, put in the standard amount of gear oil, and - howling under thrust, not as much when off the power.
Any ideas out there on remedies I could try short of a total rebuild?
Thanks