Demand Genuine Spicer. Made in the USA & complete with all the components needed for the repair. Dana design, engineering, testing and manufacturing processes all work in conjunction with one another to ensure unparalleled performance that non-genuine parts simply cannot deliver. Spicer gearing offers the easiest possible set-up, a quieter ride and strength that cannot be beaten. All gears go through a rigorous production to ensure quality. Statistically controlled heat treatment optimal hardness. Three axis face hobbling reduces noise, vibration & harshness while delivering the smoothest possible ride. Shot Peening doubles fatigue life by shooting micro beads at the root of the tooth. Gears are lubricated by adding a chemical finish to remove the break in period other aftermarket gears require.