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Ring Pinion Z

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Before we installed the supercharger, we wanted to install 4.10 gears that, with our new tires, would return the truck exactly to where the gearing was with our stock tires and 3.73s. West Coast Differentials sent us excellent U.S. gears and Sierra installation kits. West Coast also offers its own Sierra gearsets, Ford Motorsport gears, and other quality brands. The company's service is topnotch.