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The strange 9” 35-spline S-trac is a helical gear Differential that offers smooth and progressive power Transfer. If one tyre begins to slip relative to the other Tire, a separating force is created between the pinion Gears and side gears. This eparating force generates an internal frictional force, which slows the spinning wheel and sends power to the wheel with the most traction. The 35-Spline S-trac’s superior design and quality makes it ideal for the most abusive street/track applications. The 35-Spline S-Trac is Recommended For full bodied street/track cars that have ¼ mile E.T’s in the low 9 second or slower, Also ideal for road racing & off road.