Pinion Race
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See more See lessOuter Race/Cup Inside Diameter (in)
Outer Race/Cup Inside Diameter (mm)
Outer Race/Cup Outside Diameter (in)
Outer Race/Cup Outside Diameter (mm)
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The pinion is the drive gear in your differential which receives power from the driveshaft. The pinion then rotates and turns the ring gear, which spins the axles. The pinion rides on the pinion bearing and race which allows it to rotate freely. This is usually a roller style bearing, and the race is its smooth machined contact surface. Age and low fluid levels can damage the bearing and race. When the bearing or race are damaged, the pinion may not roll smoothly, and cause a whirring noise when speeding up or slowing down. If you notice noises from your axle, differential, or driveshaft, check your bearings and U-joints. If you need a pinion bearing, U-joint, or other differential parts, check out your options at O'Reilly Auto Parts.
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