Serious power requires a serious damper. Protect your truck engine with the technology preferred by heavy duty diesel OEMs. Superior viscous damper design controls harmful torsional vibration across the entire rpm range. Reduce wear on engine components. Reduce risk of crankshaft failure. Improve timing. Unleash lost torque and horsepower. Competition built precision CNC machined and balanced high-grade steel components. Corrosion resistant black zinc finish with engraved timing marks. No maintenance required. Trusted by leading performance diesel engine builders worldwide. SFI 18.1 certified. Made in USA.Fitment Note: High Strength Bolt Kit p/n 300016 recommended for high-performance applications.Fitment Note: Dry Sump Adapter p/n 400018 available separately.Fitment Note: Not compatible with high-output dual belt alternator configurations.