CHRYSLER 4621951 Balance Shaft Gear

( Manufacturer Part Number: 4621951 ), ( Part Type: Shaft Gear )

Review CHRYSLER Balance Shaft Driven Gear New Oem

The **Chrysler 4621951 Balance Shaft Gear** is a precision-engineered component designed specifically for high-performance and muscle car applications, particularly those featuring the legendary **Chrysler Hemi V8 engines** from the 1960s through the early 1980s. This critical part plays a vital role in maintaining the smooth operation and longevity of the engine by reducing vibrations caused by the imbalance of the rotating crankshaft and connecting rods. Crafted from high-grade **steel alloy**, the balance shaft gear is machined to exacting tolerances to ensure seamless integration with the engine s balance shaft assembly, which helps counteract the torsional forces generated during high-revving operation. Whether installed in a classic **426 Hemi, 440 Six-Pack, 426 Magnum, or 392/440 Magnum**, this gear is essential for preserving the engine s structural integrity, especially under heavy loads or at elevated RPMs where vibration can become a significant concern. The **4621951** is a direct-fit replacement for OEM parts that may have worn or failed over time, ensuring that the balance shaft assembly functions optimally to deliver the signature **Hemi power and reliability** for which these engines are renowned. Ideal for both restoration projects and high-performance builds, this gear is a must-have for enthusiasts seeking to restore or enhance the performance of their Chrysler-powered vehicles while maintaining the engine s original character and durability.

**Pros and Cons of Buying a Chrysler 4621951 Balance Shaft Gear**

The Chrysler 4621951 balance shaft gear is a critical component for Chrysler engines equipped with balance shafts, particularly those in the 3.0L, 3.3L, and 3.5L V6 platforms (e.g., 300C, PT Cruiser, Crossfire, and some Dodge models). Below is a detailed breakdown of its advantages and disadvantages.

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### **Pros of Purchasing a Chrysler 4621951 Balance Shaft Gear**

1. **Restores Engine Balance and Smoothness**

The balance shaft gear compensates for vibrations caused by the engine s rotating and reciprocating masses. A worn or damaged gear can lead to rough idle, excessive vibration, and poor drivability. Replacing it restores proper balance, improving ride comfort and engine performance.

2. **Prevents Further Engine Damage**

If the balance shaft gear fails, it can cause excessive wear on the balance shaft bearings, timing chain/gear, or even the crankshaft. Replacing it proactively can avoid costly repairs to other engine components.

3. **OEM Quality and Fitment**

The Chrysler 4621951 is an original equipment part (OEM), meaning it is designed to match the factory specifications exactly. This ensures proper fitment, durability, and compatibility with the engine s timing system.

4. **Aftermarket Availability and Cost-Effectiveness**

While not always cheap, this part is widely available from both Chrysler dealers and aftermarket suppliers (e.g., Mopar, RockAuto, or specialty manufacturers like Fel-Pro or Gates). Prices are generally reasonable compared to the potential cost of engine damage from neglecting it.

5. **Increases Engine Longevity**

A properly functioning balance shaft system reduces stress on the engine s internals. Over time, this can extend the life of the engine, especially in high-mileage or performance applications.

6. **Easier Installation with Proper Tools**

While the job requires precision, the part is straightforward to install with the right tools (e.g., timing chain tool, gear puller, and torque wrench). Many mechanics and DIYers can handle it with basic mechanical skills.

7. **Compatibility with Performance Modifications**

If you plan to modify your engine (e.g., forced induction, cam upgrades), a fresh balance shaft gear ensures the balance system remains effective under increased stress.

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### **Cons of Purchasing a Chrysler 4621951 Balance Shaft Gear**

1. **Labor-Intensive Installation**

Replacing the balance shaft gear requires removing the timing cover, accessing the balance shafts, and often the timing chain/gear. This can be time-consuming, especially for inexperienced mechanics. In some cases, it may also require removing the intake manifold or other components for clearance.

2. **Potential for Misalignment**

If not installed correctly, the balance shaft gear can become misaligned with the crankshaft or timing chain. This can lead to premature wear, rattling noises, or even catastrophic failure if the gear jumps off the shaft.

3. **Cost of Additional Components**

While the gear itself may be affordable, the job often requires new timing chain guides, tensioners, or even the entire timing chain set if they are worn. These additional parts can increase the total cost significantly.

4. **Risk of Contamination**

If the timing cover or engine bay is dirty, debris can enter the balance shaft system during installation. This can cause premature wear or failure of the new gear.

5. **Diagnostic Challenges**

Symptoms of a failing balance shaft gear (e.g., rough idle, vibration, or ticking noises) can mimic other issues like worn valve train components, ignition problems, or exhaust leaks. This may require additional diagnostics to confirm the root cause before purchasing the part.

6. **Limited Lifespan in High-Stress Applications**

While the gear itself is durable, if the engine is heavily modified (e.g., high RPM tuning, aggressive camshafts, or forced induction), the balance shaft system may wear out faster than in stock applications. Regular maintenance (e.g., oil changes with proper viscosity) is essential.

7. **Dealer vs. Aftermarket Price Differences**

Purchasing from a Chrysler dealer may be more expensive than buying from an aftermarket supplier. However, aftermarket parts may not always be as reliable, so quality should be prioritized over cost.

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### **Conclusion**

The Chrysler 4621951 balance shaft gear is a **necessary replacement** if your engine exhibits symptoms of balance shaft failure, such as rough idle, excessive vibration, or unusual noises. The part itself is relatively straightforward to source and install, but the job requires careful attention to detail to avoid misalignment or contamination.

**If your engine is showing signs of balance shaft issues, replacing the gear is a cost-effective way to restore smooth operation and prevent further damage.** However, if the engine is high-mileage or has other underlying issues (e.g., worn timing chain, low oil pressure), addressing those problems concurrently may be wise.

- **Buy the part from a reputable supplier** (e.g., Mopar, RockAuto, or a trusted aftermarket brand) to ensure quality.

- **Follow the manufacturer s torque specifications** and use proper tools to avoid misalignment.

- **Consider replacing related components** (e.g., timing chain guides, tensioners) if they appear worn during installation.

- **If unsure about installation**, consult a professional mechanic, especially if you lack experience with timing-related repairs.

- **Monitor the engine afterward** for any unusual noises or vibrations to confirm the repair was successful.

Ultimately, replacing a failing balance shaft gear is a **proactive and worthwhile investment** in maintaining your engine s health and performance.

Details:

Buyer should verify this is the exact part needed before purchasing.

part #: 4621951 prices

• $46.58-$65.30

specifications cranshafengin:

• for makes: Chrysler
• mpn: 4621951
• part type: Shaft Gear

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• cost: $0.00
• service: Standard
• class: Standard
• type: Fixed
• transit: 2-4 Days

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• time: 30 Days
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• policy: Returns Accepted

general cranshafengin:

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

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• best offers: True
• options: Ship-to-home
• started: June 1, 2026
• quantity: 1
• sold: 0
• availability: In Stock

seller cranshafengin:

• city: Columbus, Wisconsin
• # reviews: 16826
• rating: 99.8%

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