GM 12586895 Balance Shaft Driver 12577199 General 3.5L 12596298

( Brand: Gm ), ( Manufacturer Part Number: 12586895 ), ( Part Type: Shaft Driver Motor ), ( Ipn: 12577199 ), ( Manufacturer Warranty: 90 Days ), ( Oe/oem Part Number: 12596298 ), ( Fitment Type: Direct Replacement )

Review GM General Motors Balance Shaft 3.5l Colorado Hummer Driver Side fits CANYON

The **OEM-quality 12586895 balance shaft assembly (12596298)** is a precision-engineered component designed exclusively for the **3.5L V8 Canyon/Hummer H3 (H3T) and H2 (SUT) platforms**, ensuring optimal performance, longevity, and reliability under demanding driving conditions. Crafted from high-grade forged steel and meticulously balanced during manufacturing, this balance shaft set is engineered to counteract the inherent vibrations generated by the high-revving, naturally aspirated or turbocharged **5.3L and 6.0L V8 engines** (though specifically tailored for the 3.5L application in this case) that share the same drivetrain architecture. The assembly consists of two counter-rotating shafts each featuring **helical gear teeth** and **precision-machined journals** that rotate in opposite directions to neutralize torsional forces, significantly reducing engine strain, drivetrain fatigue, and unwanted noise, particularly in the mid-to-high RPM range. This critical component is a direct replacement for the factory-installed balance shaft system, maintaining identical mounting points, shaft diameters, and gear ratios to guarantee a seamless fit and identical functionality. Ideal for both **restoration projects** and **high-mileage vehicles**, this balance shaft set is built to withstand the rigors of daily driving, off-road adventures, or heavy towing demands, while also serving as a proactive measure to prevent catastrophic engine damage from prolonged vibration-induced stress. Whether installed during a full engine rebuild or as part of a targeted drivetrain upgrade, this component is a testament to GM s original engineering standards, ensuring that your Canyon, Hummer H3, or H2 continues to deliver the power, smoothness, and durability expected from these legendary trucks.

### **Pros and Cons of Buying a 12586895 GM Balance Shaft 3.5L Canyon/Hummer Driver Engine (Part Number: 12596298)**

1. **High Performance and Power** The 3.5L V6 EcoTec3 engine is known for delivering strong torque and horsepower, making it suitable for heavy-duty applications like the Hummer H2 or Canyon-based trucks. It provides reliable power for towing, hauling, and off-road use.

2. **Durability and Longevity** GM s balance shaft engines are engineered for robustness, with reinforced components to withstand high stress. Proper maintenance can extend its lifespan significantly, often exceeding 200,000 300,000 miles with regular upkeep.

3. **Fuel Efficiency (Compared to Older V8s)** While not as efficient as modern turbocharged engines, it offers better MPG than older GM V8s (e.g., 5.3L or 6.0L LS-series), making it a more economical choice for daily driving or light-duty work.

4. **Proven Reliability** This engine has been used in various GM vehicles (Hummer H2, Canyon, Silverado, etc.) for over a decade, with a strong track record of reliability when maintained correctly. Common issues are manageable with proper care.

5. **Aftermarket Support** Due to its popularity, parts, modifications, and tuning options are widely available. Performance upgrades (e.g., cold air intakes, exhaust systems, or ECU tuning) can enhance power and drivability.

6. **Compatibility with Modern Tech** The engine integrates well with modern fuel injection, ignition, and emissions systems, reducing the need for extensive modifications when swapping into newer vehicles.

7. **Lower Cost Than New Engines** Compared to brand-new engines, this used/rebuilt unit is significantly cheaper, making it an attractive option for budget-conscious buyers.

8. **Good for Heavy-Duty Use** The 3.5L V6 is often preferred over smaller engines (e.g., 5.3L V8) in applications where weight reduction is desired without sacrificing power, such as in off-road or modified vehicles.

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1. **Potential for Wear and Tear** If the engine is high-mileage or improperly maintained, it may require rebuilds or major repairs (e.g., valve train issues, oil leaks, or rod bearing wear). Always check for signs of distress (oil consumption, knocking, or misfires).

2. **Common Issues with Balance Shaft Engines**

- **Balance Shaft Bearings:** These can wear out over time, leading to vibrations or ticking noises. Replacement is costly ( $1,000 $1,500) and requires disassembly.

- **Oil Leaks:** Common from valve cover gaskets, oil pan gaskets, or rear main seals. Regular inspections are necessary.

- **Rod Bearings:** Some units develop rod knock, which can lead to catastrophic failure if ignored.

- **Fuel Injector Problems:** Carbon buildup or failing injectors can cause rough idling or poor performance.

3. **Emissions Compliance** Older balance shaft engines may not meet modern emissions standards if swapped into newer vehicles without modifications (e.g., OBD-II tuning or catalytic converter upgrades).

4. **Limited Lifespan Compared to Modern Engines** While durable, it lacks the advanced fuel efficiency and longevity of newer turbocharged or direct-injection engines (e.g., GM s 6.2L V8 or 3.0L EcoBoost).

5. **Rebuild Costs Can Be High** If the engine is damaged, a full rebuild (including balance shafts, rods, and bearings) can cost **$3,000 $5,000 **, depending on labor and parts.

6. **Not Ideal for Extreme Modding** Unlike turbocharged engines, this naturally aspirated V6 has limited headroom for forced induction without significant modifications (e.g., reinforced internals, upgraded cooling).

7. **Discontinued Parts Supply** While still available, some OEM parts may become harder to find over time, increasing reliance on aftermarket alternatives.

8. **Potential for Hidden Damage** Without a thorough inspection (compression test, leak-down test, or engine teardown), buyers risk purchasing a unit with internal damage that isn t immediately obvious.

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The **12586895 GM 3.5L Balance Shaft V6 (12596298)** is a **strong, reliable, and cost-effective choice** for those looking to restore power to a Hummer H2, Canyon, or other compatible vehicles. It offers **good torque, durability, and aftermarket support**, making it ideal for **daily driving, light towing, or off-road use** especially if the buyer is prepared for **regular maintenance and potential rebuilds**.

However, it is **not without risks**. Buyers must **prioritize engine condition** (check for leaks, knocks, and oil consumption) and **budget for potential repairs** (balance shafts, rod bearings, or injectors). If the engine is **high-mileage or poorly maintained**, the **long-term costs may outweigh the benefits**.

For **budget-conscious enthusiasts** who want a **proven, high-torque engine** without the complexity of turbocharged setups, this is a **solid option**. For those seeking **modern efficiency or extreme power**, newer engines (e.g., GM s 6.2L V8 or turbocharged V6s) may be preferable.

---

- Purchase from a **reputable engine swap shop** or **GM-authorized dealer** with a **warranty** (even a limited one).

- Request **full service history** and **compression/leak-down tests** to ensure health.

- Budget for **balance shaft replacement** ( $1,000 $1,500) if the engine is older.

- **Inspect thoroughly** for oil leaks, knocks, or unusual noises.

- **Test-drive** and monitor for **rough idling, misfires, or excessive smoke**.

- **Consider a rebuild** if the engine is over **200,000 miles** or shows signs of wear.

- **Swap into a compatible vehicle** (Hummer H2, Canyon, or Silverado) with a **proven transmission** (e.g., 4L60E or 4L80E).

- **Use high-quality oil** (5W-30 or 5W-40) and **change it frequently** (every 5,000 7,500 miles).

- **Monitor for oil leaks** and replace gaskets/seals proactively.

- **Avoid excessive towing** if the engine is not reinforced (consider a **performance exhaust or intercooler** for cooling).

- **GM 6.0L V8 (LS3/L96):** More power, better modern tech, but heavier and thirstier.

- **Ford 5.0L Coyote:** High-revving, tuner-friendly, but less torque at low RPMs.

- **Turbocharged 3.0L EcoBoost:** Better fuel efficiency, but requires more maintenance.

The **3.5L balance shaft V6 is a great choice for those who prioritize torque, durability, and cost efficiency** but only if the engine is **well-maintained and inspected**. For **extreme builds or daily drivers**, weigh the **pros and cons carefully** and consider **alternative engines** if longevity and modern tech are priorities.

Details:

GMC Canyon 2004 - 2006 3.5L. Part # 12596298. Hummer 2006 3.5L.

part #: 12586895 price

• $199.95

specifications cranshafengin:

• for models: Canyon
• for makes: Hummer
• brand: Gm
• mpn: 12586895
• part type: Shaft Driver Motor
• ipn: 12577199
• manufacturer warranty: 90 Days
• oe/oem part number: 12596298
• fitment type: Direct Replacement

general cranshafengin:

• condition: New
• Car Truck Parts Accessories > Engines Engine Parts > Crankshafts

payments cranshafengin:

• wallet: Paypal
• other
• credit card: Discover

offer cranshafengin:

• started: May 19, 2026
• sold: 0
• options: Ship-to-home
• availability: In Stock
• quantity: 2

seller cranshafengin:

• city: Dallas, Texas
• rating: 99.5%
• # reviews: 23195

returns cranshafengin:

• time: 30 Days
• policy: Returns Accepted
• paid by: Seller

shipping cranshafengin:

• service: UPS Ground
• transit: 2-7 Days
• type: Fixed
• carrier: UPS
• cost: $0.00
• class: Standard

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