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The pinion snubber looks a lot better than traction bars hanging under the car. It prevents axle wind-up, critical in violent high-horsepower cars that want to climb the ring gear and turn the springs upside-down on launch. For street cars, the snubber can be set up an inch off of the pan for better grab; on street/strip cars, 1/4-inch to 1/2-inch space is good. The idea is to control the suspension motion and get the pinion angles correct as the car reacts under acceleration.