1. Engine Crankshafts Products
  2. sku: 19563597126271892
  3. POWERBOND DAYCO SX-3780

POWERBOND BY DAYCO SX-3780 Engine Harmonic Balancer Cylinder 5.7L V8

fits model: G1500. make: Gmc. year: 1979–1993.

Sx-3780 Powerbond By Dayco Engine Harmonic Balancer For 1979-1993 Gmc G1500 5.7l V8 Cylinder Cs

( Brand: Powerbond By Dayco ), ( Manufacturer Part Number: SX-3780 ), ( Item Weight: 11.6700 ), ( Ipn: C247 36-51 ), ( Placement On Vehicle: Engine Cylinder Block ), ( Compatible Year: 1993 1992 1991 1990 1989 1988 1987 1986 1985 1984 1983 1982 1981 ), ( Core Charge: Free No Core Charge ), ( Type: Engine Harmonic Balancer ), ( Fitment Type: Direct Replacement ), ( Bundle Description: 1 Pc Genuine Dayco Engine Harmonic Balancer ), ( Timing Marks: Yes ), ( Overall Width: 2.347 In / 59.60 Mm ), ( Hardware Included: No ), ( Ring Width: 1.523 In / 38.68 Mm ), ( Counterweight Balance: Neutral, No Counterweight ), ( Outer Ring Material: Steel ), ( Overall Outside Diameter: 7.953 In / 202.00 Mm ), ( Nose Outside Diameter: 1.762 In / 44.75 Mm ), ( Crank Bore: 1.245 In / 31.60 Mm )

Review POWERBOND BY DAYCO Engine Harmonic Balancer Gmc 5.7l V8 Cylinder Cs fits G1500 1979–1993

The **Powerbond Dayco SX-3780 Engine Harmonic Balancer** is a premium, high-performance replacement part designed specifically for the **1979 1993 GMC G1500** equipped with the legendary **5.7L (350 cubic inch) Chevrolet Small Block V8 engine**, particularly those featuring the **Cylinder Shroud (CS) variant**. This critical component plays a vital role in dampening the torsional vibrations generated by the engine s rotating assembly, ensuring smooth operation, reduced wear on the crankshaft and drivetrain, and an overall enhancement in drivability and longevity. Crafted from **high-strength, precision-machined steel**, the Powerbond balancer is engineered to withstand the rigorous demands of heavy-duty applications, whether your G1500 is used for daily commuting, towing, off-roading, or high-performance driving. Its robust construction features a **heavy-duty rubber insert** that is engineered to maintain optimal vibration control over an extended service life, minimizing the risk of premature failure a common issue with lower-quality aftermarket replacements. The SX-3780 is meticulously designed to fit seamlessly with the **CS shroud variant**, ensuring proper alignment with the crankshaft pulley and flywheel housing, which is essential for accurate balancing and preventing excessive stress on the engine s internal components. Whether you re restoring a classic G1500 for nostalgia or upgrading a modernized truck for enhanced reliability, this harmonic balancer delivers a **durable, long-lasting solution** that exceeds OEM standards. Backed by Dayco s reputation for quality and Powerbond s commitment to performance, this part is an excellent choice for enthusiasts and professionals alike who demand nothing less than the best for their Chevrolet-powered GMC trucks.

The **Powerbond Dayco SX-3780 Engine Harmonic Balancer** is a popular aftermarket replacement for the stock harmonic balancer on the **1979 1993 GMC G1500 with the 5.7L (350 CID) V8 (Chevy Small Block)**. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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### **Pros of the Powerbond Dayco SX-3780 Harmonic Balancer**

1. **Durability and Strength**

The Powerbond balancer is made from **high-quality steel** and features a **reinforced rubber insert**, which is designed to last longer than the stock unit. Many users report that it holds up well under heavy loads, towing, and high-performance applications.

2. **Reduced Vibration and Smooth Operation**

A properly installed harmonic balancer helps dampen engine vibrations, especially in high-performance or modified engines where the stock unit may wear out prematurely. The Powerbond balancer is engineered to provide better vibration control compared to the original equipment (OEM) part.

3. **Compatibility with Performance Modifications**

If your GMC is modified with a **performance camshaft, forced induction, or high RPM applications**, the stock harmonic balancer may not handle the increased stress. The Powerbond unit is a common upgrade for such setups, offering better resistance to wear and tear.

4. **Easier Installation**

The SX-3780 is a **direct drop-in replacement** for the OEM balancer, meaning no modifications to the engine are required. It fits standard flywheel housing bolts and does not require special tools for installation.

5. **Positive User Feedback**

Many truck owners and mechanics report **fewer issues with vibration, rattling, or premature failure** after installing this balancer. It is a well-regarded brand in the aftermarket, with a reputation for reliability.

6. **Affordable Upgrade**

Compared to some high-end aftermarket balancers, the Powerbond SX-3780 is **relatively inexpensive**, making it a cost-effective solution for those who want an improvement over the stock unit without breaking the bank.

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### **Cons of the Powerbond Dayco SX-3780 Harmonic Balancer**

1. **Not a Permanent Fix for Severe Wear**

While the Powerbond balancer is an improvement over the stock unit, it is **not indestructible**. In extreme cases such as **constant high RPM, severe modifications, or neglect** even this balancer can fail over time. It is not a "lifetime" part.

2. **Potential for Misalignment if Not Installed Properly**

If the balancer is **not centered correctly** on the crankshaft or the flywheel housing bolts are not tightened to specification, it can lead to **vibration issues, rattling, or even damage to the crankshaft pulley**. Proper installation is critical.

3. **Limited Warranty**

Powerbond offers a **limited warranty**, but it is typically shorter than some premium brands. If the balancer fails prematurely due to a defect, replacement may not be covered under all circumstances.

4. **Some Users Report Early Failure in Aggressive Applications**

While many users have no issues, a small percentage of owners particularly those running **extreme horsepower, turbocharging, or aggressive camshafts** report that the Powerbond balancer may still fail sooner than expected. In such cases, a **heavier-duty balancer (e.g., from Clevite, Moroso, or a custom-built unit)** may be necessary.

5. **Requires Regular Inspection**

Like any harmonic balancer, the Powerbond unit should be **checked periodically** for cracks, rubber degradation, or wobble. Neglecting this can lead to sudden failure and potential damage to the crankshaft pulley or other components.

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### **Conclusion**

The **Powerbond Dayco SX-3780 harmonic balancer** is a **solid aftermarket upgrade** for the **1979 1993 GMC G1500 5.7L V8**, offering **better durability, vibration control, and compatibility with mild to moderate modifications** compared to the stock unit. It is a **cost-effective choice** for most truck owners who want an improvement without investing in a premium balancer.

However, it is **not a universal fix** for extreme performance applications. If your engine is **heavily modified, turbocharged, or runs at very high RPMs consistently**, you may need a **heavier-duty balancer** (such as a **Clevite 1000, Moroso, or a custom-built unit**) to ensure long-term reliability.

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### **Recommendation**

- **For Stock or Mildly Modified Engines (Street/Weekend Driving, Light Towing):**

The **Powerbond Dayco SX-3780 is an excellent choice**. It provides a noticeable improvement over the stock balancer and is a **reliable, budget-friendly upgrade**.

- **For Performance or Aggressive Applications (High Horsepower, Turbocharging, Heavy Towing):**

Consider a **heavier-duty balancer** (e.g., **Clevite 1000, Moroso, or a custom-built unit**) to ensure it can handle the increased stress. Additionally, **regular inspection and maintenance** are crucial.

- **Installation Tips:**

- Ensure the **crankshaft pulley is properly aligned** before installing the balancer.

- Tighten the **flywheel housing bolts to the manufacturer s specification** (usually around **80 100 ft-lbs**).

- Use a **balancer centering tool** if available to ensure proper alignment.

- If the balancer wobbles excessively after installation, it may need to be **recentered or replaced**.

- **Final Verdict:**

The **Powerbond Dayco SX-3780 is a well-regarded, cost-effective upgrade** for most **1979 1993 GMC G1500 5.7L V8** applications. It is **not the absolute best for extreme builds**, but it is a **strong, reliable choice** for the average owner. If you experience **vibration, rattling, or premature failure**, reassess your installation or consider a more robust balancer.

Details:

Dayco Engine Harmonic Balancer for 1979 1993 GMC G1500 5.7L V8 Cylinder cs: Status: In Stock.

specifications cranshafengin:

  • for models: G1500
  • for makes: Gmc
  • for years: 1979-1993
  • brand: Powerbond By Dayco
  • mpn: Sx-3780
  • item weight: 11.6700
  • ipn: C247 36-51
  • placement on vehicle: Engine Cylinder Block
  • compatible year: 1993 1992 1991 1990 1989 1988 1987 1986 1985 1984 1983 1982 1981
  • core charge: Free No Core Charge
  • type: Engine Harmonic Balancer
  • fitment type: Direct Replacement
  • bundle description: 1 Pc Genuine Dayco Engine Harmonic Balancer
  • timing marks: Yes
  • overall width: 2.347 In / 59.60 Mm
  • hardware included: No
  • ring width: 1.523 In / 38.68 Mm
  • counterweight balance: Neutral, No Counterweight
  • outer ring material: Steel
  • overall outside diameter: 7.953 In / 202.00 Mm
  • nose outside diameter: 1.762 In / 44.75 Mm
  • crank bore: 1.245 In / 31.60 Mm

seller cranshafengin:

  • rating: 99.6%
  • # reviews: 638714
  • city: Indianapolis, Indiana

general cranshafengin:

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

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  • time: 30 Days

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  • cost: $0.00
  • type: Fixed
  • class: Standard, Expedited
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  • sold: 0
  • options: Ship-to-home
  • started: March 29, 2026
  • availability: In Stock
  • quantity: 2

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for models: g1500, for makes: gmc, for years: 1979-1993, item weight: 11.6700, placement on vehicle: engine cylinder block, compatible year: 1993 1992 1991 1990 1989 1988 1987 1986 1985 1984 1983 1982 1981, core charge: free no core charge, type: engine harmonic balancer, fitment type: direct replacement, bundle description: 1 pc genuine dayco engine harmonic balancer, timing marks: yes, overall width: 2.347 in / 59.60 mm, hardware included: no, ring width: 1.523 in / 38.68 mm, counterweight balance: neutral, no counterweight, outer ring material: steel, overall outside diameter: 7.953 in / 202.00 mm, nose outside diameter: 1.762 in / 44.75 mm, crank bore: 1.245 in / 31.60 mm,
category: auto parts > car truck parts accessories > engines engine parts > crankshafts, sku: 19563597126271892,
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