Ever notice how a Gear Set tends to start "Whining" as it gets old? Well, the differential in my Chevrolet "Bee" Van had over 500,000 miles on it! I shit you not, you drive that and it would sound like an Air Raid Siren. Why do they do this? Ultimately, they wear to each other in such a way that they are exact Mirror Surfaces of the Gears!
