If you've got a powerful 6.6L Duramax truck, its not unusual for your truck to vibrate with all that potential horsepower. However, if you've got some torsional crankshaft vibrations happening, it is worth grabbing a good quality harmonic balancer. Coming in with their Super Diesel Harmonic Balancer designed for the 01-05 GM 6.6L Duramax is ATI's solution to those unwelcomed crankshaft vibrations. Designed and fitted for high end performance and heavy duty tow builds, this harmonic balancer exceeds SFI 18.1 safety certifications and can hold its own in competition builds. The vibration mitigation is a result of the laser etched timing marks for long lasting efficiency and its black zinc chromate finish!