ATP 102427 Engine Harmonic Balancer 3-Groove Serpentine

The ATP 102427 is a direct-fit OE-replacement engine harmonic balancer designed to restore proper crankshaft vibration damping and maintain smooth, balanced engine operation. Harmonic balancers — also known as crankshaft dampers or vibration dampers — absorb and cancel torsional vibration pulses generated by the firing strokes of the engine, protecting the crankshaft and drivetrain from premature wear. This unit features a 3-groove serpentine belt pulley configuration and is precision-machined to original equipment specifications.

Key Features:

• OE-replacement design engineered to install and function exactly as the original
• Manufactured from high-grade metals with bonded or pressed rubber meeting original specifications
• Precision-machined components with dynamic balancing for optimal performance
• 3-groove serpentine drive belt pulley
• Inside diameter: 1.375 in (35 mm); outside diameter: 6.9375 in (176 mm); depth: 3.625 in (92.5 mm)
• 3 mounting holes; bolts and washers not included
• Standard replacement grade

ATP harmonic balancers deliver reliable, long-lasting crankshaft vibration damping using quality materials and construction processes consistent with the original equipment design. Fits select 2001–2005 GMC Sierra 3500 and 2005 Workhorse LF72 applications. Note that bolts and washers are not included and must be reused or sourced separately.