Hummer H3T Harmonic Balancer Assembly For 2009 2010 Cast Iron Black Serpentine Drive Belt Replacement Fits OEM 12578070 12578071 45.5mm Depth 31.94mm Inner Diameter
✔️ Cast iron balancer, serpentine drive; OEM 12578070/12578071
This harmonic balancer assembly is a direct OEM-style replacement designed for 2009-2010 H3T models. It connects the crankshaft to the serpentine belt drive, helping dampen torsional vibrations and keep accessory pulleys aligned. Cast iron construction with a black finish ensures durability in typical engine bay conditions and is brand-new, sealed in its box.
✅ Pack: 1 single unit, boxed and ready to install
✅ Fits OEM numbers: 12578070, 12578071
✅ Material: cast iron body with black finish
✅ Drive: serpentine belt compatible
✅ Dimensions: 45.5 mm depth, 31.94 mm inner diameter
✅ Condition: brand new, sealed in box
💡 What is a harmonic balancer and why should you replace it in your engine? A quick handy explanation follows.
- OEM-style replacement supports proper timing belt alignment and damping
- Cast iron balancers offer durability in high-heat engine bays
- Replacing helps reduce crankshaft vibration and engine wear
- Compatible with serpentine belt drive systems