7.425 Super Damper - SFI Duramax 11-Up LM

The ATI Performance 7.425 Super Damper for SFI Duramax 11-Up LM engines is a precision harmonic balancer engineered to reduce crankshaft vibration and protect engine internals during high-output operation. Purpose-built for 2011–2020 GM Duramax diesel engines, this balancer addresses the unique harmonic frequencies generated by heavy-duty turbodiesel powerplants. Whether you're upgrading a stock engine or reinforcing a modified build, the Super Damper stabilizes crankshaft oscillation, extending bearing life and improving overall engine reliability under sustained load.

Constructed from steel with a black oxide finish, the 7.425-inch outer diameter balancer features external balance geometry matched to 2011–2020 Duramax specifications and carries SFI 18.1 certification for performance and safety compliance. The robust elastomer ring inside the balancer absorbs torsional vibration across the RPM range, preventing resonance peaks that can fatigue crankshafts, main bearings, and accessory drive components. This external balance design ensures proper weight distribution and compatibility with factory Duramax harmonic requirements, delivering consistent damping performance without the fitment compromises of universal designs.

Duramax owners running increased boost, tuning, or extended towing benefit most from the Super Damper's reinforced construction and engineered damping profile. Installation requires proper balancer removal and crankshaft indexing tools; the SFI certification confirms this component meets competition and high-performance standards. Direct fitment to GM Duramax 2011–2020 trucks ensures no additional modifications, adapter rings, or offset adjustments are needed—simply mount and secure according to factory specifications.