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Hummer 12578070 Balancer, Crankshaft

2006-2010 Hummer

Customer Questions & Expert Answers (3)
12578070 GM Balancer, Crankshaft Product Photo 1 of 3
  • Part Description
    BALANCER, Engine Crankshaft
  • Manufacturer
    General Motors
  • Manufacturer's Notes
    This part is discontinued.
Make sure this part fits
  • Related Parts
  • Specifications
  • Fitment
  • Q&A
  • Product Specifications

    BrandGenuine Hummer
    Manufacturer Part Number12578070
    Part DescriptionBALANCER, Engine Crankshaft
    Other NamesBalancer, Crankshaft Balance, Vibration Damper
    Item Dimensions9.2 x 8.2 x 3.0 inches
    Item Weight7.10 Pounds
    ConditionNew
    Fitment TypeDirect Replacement
    ManufacturerGeneral Motors
    SKU12578070
    WarrantyThis genuine GM part is guaranteed by GM's factory warranty.
    Shipping & ReturnShipping Policy Return Policy
    Warning: California's Proposition 65
  • Vehicle Fitment

    Year Make Model Engine Important vehicle option details
    2006-2010 Hummer H35 Cyl 3.5L, 5 Cyl 3.7LCREW CAB, SUV
    2009-2010 Hummer H3T5 Cyl 3.7LCREW CAB, SUV
  • Customer Questions & Expert Answers

    Q:
    I'm wondering if this is complete and correct part for my vehicle.
    A:
    You can Select Your Vehicle to check if 12578070 fits your vehicle.
    Posted and answered by GM Parts Specialist Julian
    Q:
    What is the final step in the installation process for the Harmonic Balancer on the 2010 Chevrolet Colorado? Posted by Rollin G.
    A:
    Install a new crankshaft balancer bolt and tighten it to the specified torque and angle of rotation, then complete the installation by reversing the removal steps. You can Select Your Vehicle to see complete installation and repair tips.
    Answered by GM Parts Specialist Nicholas / Dec 08, 2025
    Q:
    How do you check the installation measurement of the Harmonic Balancer for the 2009 GMC Canyon? Posted by Keshunda J.
    A:
    Measure the distance from the snout of the crankshaft to the balancer hub; the hub should extend 3/32 to 11/64-inch past the crankshaft snout when properly installed. You can Select Your Vehicle to see complete installation and repair tips.
    Answered by GM Parts Specialist Jose / Mar 24, 2023

Genuine GM Part 12578070, the Right Choice

To ensure reliability, purchase GM part # 12578070 Balancer, Crankshaft. It is sometimes referred to as Hummer Harmonic Balancer. Directly from GM, genuine parts are superb with regards to quality, longevity, and fit. Every single part passed stringent quality testing, so you can be sure that it's safe, durable, and built to perform like your original parts. This part fits specific Hummer H3, H3T models.

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