GM GENUINE PARTS 12678926 Crankshaft Balancer 808709608622

( Brand: Gm Genuine Parts ), ( Manufacturer Part Number: 12678926 ), ( UPC: 808709608622 )

Review GM GENUINE PARTS Crankshaft Balancer

The **GM 12678926 Crankshaft Balancer** is a precision-engineered, high-performance accessory designed specifically for General Motors applications requiring optimal vibration control and smooth operation in high-stress engine environments. This robust component is meticulously crafted to address the critical need for dynamic balance within crankshaft assemblies, particularly in performance-oriented or heavily modified engines where excessive vibration can lead to premature wear, reduced longevity, or even catastrophic failure. Built with durable materials, including high-grade steel and reinforced bearings, the GM 12678926 crankshaft balancer ensures seamless integration with the engine s rotating assembly, effectively counteracting torsional forces and harmonic distortions that can arise from uneven crankshaft movement. Its compact yet sturdy design allows for easy installation, whether in stock applications or aftermarket setups, making it an ideal solution for both restoration projects and high-performance builds. Whether used in muscle cars, racing engines, or high-mileage vehicles requiring enhanced stability, this balancer delivers reliable performance under extreme conditions, helping to extend the life of critical engine components while maintaining peak efficiency. Engineered to meet or exceed OEM specifications, the GM 12678926 crankshaft balancer is a trusted choice for mechanics and enthusiasts seeking a balance between durability and performance.

### **Pros and Cons of Buying a GM 12678926 Crankshaft Balancer**

The GM 12678926 crankshaft balancer is a critical component for maintaining engine balance, vibration reduction, and overall drivability in certain General Motors vehicles. Here are the key advantages of purchasing this part:

1. **Engine Stability and Smooth Operation** A properly functioning crankshaft balancer helps reduce engine vibration, which improves ride comfort and prevents excessive wear on drivetrain components (e.g., transmission, mounts, and suspension).

2. **Prevents Premature Failure** If the balancer is worn or damaged, it can lead to excessive stress on the engine block, transmission, or frame. Replacing it proactively can extend the lifespan of these systems.

3. **OEM Quality and Fit** As an original equipment manufacturer (OEM) part, the GM 12678926 balancer is designed to meet the exact specifications of the vehicle s engine bay, ensuring a proper fit and reliable performance.

4. **Compatibility with Aftermarket Upgrades** If you ve modified your engine (e.g., forced induction, performance tuning), a high-quality balancer helps maintain balance under increased loads, reducing the risk of drivetrain damage.

5. **Warranty Coverage** Purchasing from an authorized dealer or reputable supplier may include a warranty, providing peace of mind against early failure.

6. **Easier Maintenance Access** Some GM engines (particularly older models) have simpler balancer removal procedures compared to modern designs, making replacement a manageable DIY task for experienced mechanics.

---

1. **Cost** OEM balancers can be expensive, especially if purchased directly from GM or authorized dealers. Aftermarket alternatives may offer cost savings but could compromise quality.

2. **Replacement Complexity** Depending on the vehicle model, removing and installing the balancer may require specialized tools (e.g., torque wrench, alignment tools) and mechanical skill. Some engines (e.g., LS-series) have more accessible balancers, while others (e.g., older V8s) may demand more labor.

3. **Potential for Counterfeit Parts** Buying from untrusted sellers (e.g., eBay, unlicensed online marketplaces) risks receiving substandard or counterfeit parts, which could fail prematurely and cause further damage.

4. **Limited Lifespan** While balancers are durable, they can wear out over time, especially in high-performance or heavily modified engines. Regular inspection is recommended, particularly if the vehicle experiences excessive vibration.

5. **Compatibility Issues with Modified Engines** If the engine has been significantly altered (e.g., crankshaft modifications, different rod lengths), the stock balancer may no longer provide optimal balance, requiring a custom or upgraded part.

6. **Labor Costs for Professional Installation** If you re not comfortable performing the replacement yourself, labor costs at a dealership or mechanic can add significantly to the total expense.

---

### **Conclusion**

The GM 12678926 crankshaft balancer is an essential part for maintaining engine balance and preventing drivetrain issues. Its OEM quality ensures reliability, but the cost, installation complexity, and potential for counterfeit parts are valid concerns. For most drivers, replacing a worn balancer is a worthwhile investment to avoid costly repairs down the line.

If the balancer is failing (evidenced by vibration, unusual noises, or visible wear), replacement should not be delayed. However, if the vehicle is older and the balancer is still functional, it may be worth considering whether the cost of replacement justifies the benefit.

---

### **Recommendation**

1. **Verify the Need** Confirm that the balancer is indeed the source of the issue (e.g., excessive vibration, transmission or drivetrain wear). A mechanic can diagnose this accurately.

2. **Source the Part Wisely** Purchase from an authorized GM dealer, reputable aftermarket supplier (e.g., RockAuto, Summit Racing), or a trusted online retailer to avoid counterfeit parts.

3. **Consider Aftermarket Alternatives** If budget is a concern, high-quality aftermarket balancers (e.g., from Crane, Moroso, or Fel-Pro) can be a cost-effective option while maintaining reliability.

4. **DIY vs. Professional Installation** If you have mechanical experience and the proper tools, replacing the balancer yourself can save labor costs. Otherwise, a dealership or trusted mechanic is the safest choice.

5. **Inspect Related Components** While replacing the balancer, check for wear in the harmonic balancer, mounts, and drivetrain components to prevent future issues.

**Final Verdict:** If the GM 12678926 balancer is confirmed to be failing, replacing it with an OEM or high-quality aftermarket part is a recommended maintenance step to protect your engine and drivetrain. Prioritize quality and proper installation to ensure long-term reliability.

Details:

Manufacturer Part Number: 12678926. Brand: GM GENUINE PARTS. GM regularly updates production and service part designs to integrate new materials technologies. Item model number: 12678926.

Product Dimensions: 8.88 x 7.38 inches. Some GM Genuine Parts may have formerly appeared AcDelco Original Equipment OE. GM Genuine Parts 12678926 Crankshaft Balancer: Manufacturer. GM Engineers design and validate OE parts specifically for your Chevrolet, Buick, GMC, or Cadillac vehicle.

Model: GM Original Equipment. Exterior: Machined.

part #: 12678926 prices

• $245.00-$525.99

specifications mixedtoolsetse:

• brand: Gm Genuine Parts
• mpn: 12678926
• upc: 808709608622

offer mixedtoolsetse:

• sold: 0
• options: Ship-to-home
• availability: In Stock
• started: May 31, 2026
• quantity: 1

payments mixedtoolsetse:

• other
• wallet: Google-pay
• credit card: Discover

general mixedtoolsetse:

• condition: New
• Tools Workshop Equipment > Hand Tools > Hand Tool Sets

returns mixedtoolsetse:

• policy: No Returns

seller mixedtoolsetse:

• city: US
• # reviews: 838
• rating: 100.0%

shipping mixedtoolsetse:

• service: Standard
• cost: $0.00
• transit: 4-10 Days
• class: Standard
• type: Fixed

Gm Genuine Parts 12678926 Is Similar To:

• Xotic Performance 663647156648 Hardened Balancer Bolt For Chevrolet Gm Gen Iii Iv Ls 4.8l 5.3l 6.0l 6.2l Inc (22.2% similar) Optimized performance - optimized engine performance: a harmonic balancer is an essential component of your engine that helps to reduce vibrations and keep running smoothly. The precision fit of this kit ensures maximum holding power and a seamless installation process. Fits: Chevrolet gen iii/iv ...(October 15th, 2024)
• Bilitools B1e91387 Harmonic Balancer Puller Crank Pulley Removal Kit Engine Motor Rod Auto Ls Gm (25.5% similar) See details missing some Parts rods...(October 26th, 2024)
• Ares 840129907787 15085 Harmonic Balancer Puller For Gm Low Profile (33.9% similar) Features: includes: 1 pc. Reliable effective efficient: users trust ares to be quality tools that make an impact. Constructed of black phosphate-coated steel with a zinc-coated bolt, this harmonic balancer pullers hook jaw clip-on design provides strong grip and easily attaches to the without ...(November 24th, 2024)
• Gm Parts 707773692219 10224885 Crankshaft Balancer (67.4% similar) Gm regularly updates production and service part designs to integrate new materials technologies. Some Gm Genuine Parts may have formerly appeared as AcDelco original equipment OE...(November 30th, 2024)
• Gm Parts 195491151888 90537369 Balancer Chain Guide (43.8% similar) Warning: cancer and reproductive harm. Gm engineers design and validate OE Parts specifically for your Chevrolet, Buick, GMC, or Cadillac vehicle. Some Gm Genuine Parts may have formerly appeared as AcDelco original equipment OE...(December 6th, 2024)
• Gm Parts 195491151871 90537336 Balancer Chain Guide (43.8% similar) Our diverse team of 155,000 employees brings their collective passion for engineering, technology and design to deliver on this ambitious future. Gm engineers design and validate OE Parts specifically for your Chevrolet, Buick, GMC, or Cadillac vehicle...(December 6th, 2024)
• Gm Parts 707773692271 Genuine 10243271 Crankshaft Balancer Black (62.4% similar) They serve as pulleys for the engine accessory drive belts, and are Gm-recommended replacements your vehicles original components. Offering the quality, reliability, and durability of Gm OE. Manufactured to Gm OE specification for fit, form, and function. Gm Genuine Parts 10243271 crankshaft ...(December 10th, 2024)
• General Gj-57 Harmonic Balancer Damper Pulley Puller Kit Compatible With Ford Gm Chrysler Cad (23.2% similar) Package includes: 1 x 3-JAW puller with another 3 jaw to replace, 4 forcing rods, screw. Easy safe to operate: used remove damper pulleys in tight engine compartments without removing the radiator. Reduce the damage to both pulley and shaft. Compatible with Cadillac 4.5L, 4.6L, 4.9L V8;. Wide ...(December 24th, 2024)
• Proform 037995817252 Gm Specialty 141725 Harmonic Balancer Cover 6.75 Chrome With Bowtie Logo (33.3% similar) Harmonic balancer cover small block CHEVY6-3/4'' , patented cover offers improved readability, more stable top dead indication, better timing accuracy, small Chevy, 6-3/4'' diameter, aluminum, chrome, readability Chevy...(December 27th, 2024)
• Freebirdtrading D00742b Harmonic Balancer Dampener Puller Compatible For Chrysler Gm Ford Mit (21.7% similar) Saving your time without disassembling the radiator. It also works on some Mitsubishi applications. Come with a blow carrying case for easy storage.: harmonic balancer dampener puller for Chrysler Gm ford Mitsubishi. Easy operation just using 3 jaw puller arms to grip and remove spoke pressed-on ...(January 20th, 2025)
• Heiher 20214014 Ls Harmonic Balancer Installation Tool Compatible With Gm 1997-up V8 Ls1 Ls2 (24.8% similar) Meets or exceeds oem standards, 100% rigorously tested before shipping easy to use: you can thread the tool into crankshaft until it seats, and slowly twist nut pulley is in place. Great replacement for the broken or bad ls harmonic balancer installation tool package include: package include 1 PCs ...(January 26th, 2025)