CHEVROLET 12559356 Engine Crankshaft 4.8L

( Manufacturer Part Number: 12559356 ), ( Part Type: Engine Crankshaft ), ( Manufacturer Warranty: 1 Month )

Review CHEVROLET 4.8l Engine Crankshaft Oem fits SILVERADO 1500 1999–2004

The **Chevrolet 1999-2004 Silverado 1500 4.8L Engine Crankshaft (Part Number: 12559356)** is a precision-engineered component designed to deliver reliable performance and durability in one of General Motors most iconic full-size pickup trucks. This crankshaft is a critical part of the **L31 Vortec 4800** V8 engine, a powerhouse known for its robust construction and smooth operation, which powers the Silverado 1500 through demanding tasks with ease. Crafted from high-grade forged steel, the crankshaft features a **five-main-bearing design**, ensuring optimal balance, reduced vibration, and enhanced longevity under heavy loads. The **counterweighted journals** are meticulously machined to minimize stress on the engine s internal components, while the **hardened and ground surfaces** provide superior wear resistance, even in extreme conditions. Whether hauling heavy payloads, towing substantial trailers, or enduring prolonged use in rugged environments, this crankshaft is engineered to maintain structural integrity and performance consistency. Its compatibility with the **1999 through 2004 model years** of the Silverado 1500 ensures a seamless fit for owners seeking to restore or upgrade their vehicle s engine, offering a direct replacement that meets or exceeds OEM specifications. With its blend of strength, precision, and reliability, this crankshaft is an essential component for maintaining the power and efficiency of the Vortec 4800, making it a must-have for both mechanics and enthusiasts looking to preserve or enhance their truck s performance.

### **Pros and Cons of Buying a 1999 2004 Chevrolet Silverado 1500 (4.8L Engine, Crankshaft Issue)**

#### **Pros**

1. **Reliability and Durability** The 4.8L Vortec 4800 engine (when properly maintained) is known for its robustness, especially in the Silverado 1500. Many units last well over 200,000 miles with basic upkeep.

2. **Strong Towing and Hauling Capacity** The 4.8L engine produces around **250 275 horsepower** and **300 320 lb-ft of torque**, making it capable of towing **up to 8,000 10,000 lbs** with the right setup. This was a significant upgrade over the 4.3L V6 in earlier models.

3. **Proven Transmission Options** The Silverado 1500 of this era came with either a **4L60-E (4-speed automatic)** or **4L65-E (5-speed automatic)**, both of which are durable and widely supported in the aftermarket.

4. **Availability of Parts and Mechanics** Being a common work truck, parts (especially for the 4.8L engine) are widely available, and mechanics are familiar with its quirks.

5. **Potential for Modifications** The 4.8L can be upgraded with performance chips, bigger intercoolers, or even a turbocharged conversion (though the latter requires careful planning to avoid crankshaft issues).

6. **Lower Purchase Price** Compared to newer trucks, these models are significantly cheaper, making them an attractive option for budget-conscious buyers.

7. **Good Resale Value for Classic Work Trucks** If maintained well, these Silverados hold value better than some of their contemporaries due to their reputation as reliable work trucks.

---

#### **Cons**

1. **Crankshaft Issue (Primary Concern)** The **4.8L Vortec 4800** is notorious for **crankshaft failure**, particularly around **150,000 200,000 miles**. The problem stems from **cracking in the crankshaft journals** due to stress and poor lubrication. This can lead to catastrophic engine failure if not addressed.

- Oil consumption (burning oil)

- Ticking or knocking noises (especially under load)

- Rough idle or stalling

- Blue smoke from the exhaust

- Check engine light (may not always appear until failure)

- **Repair Cost:** Replacing the crankshaft (or the entire engine in severe cases) can cost **$3,000 $6,000 **, depending on labor and whether a rebuilt engine is used.

2. **Oil Leaks and Maintenance Needs** The 4.8L is prone to **valve cover, oil pan, and rear main seal leaks**, requiring frequent oil changes and gasket replacements.

3. **Transmission Wear** The **4L60-E/4L65-E transmissions** can develop **slipping, rough shifting, or solenoid failures** over time, especially if not properly maintained.

4. **Fuel Economy Limitations** The 4.8L gets **around 12 16 MPG combined**, which is decent for a truck but not great compared to modern diesel or turbocharged engines.

5. **Electrical and Computer Issues** Older Silverados (especially pre-2000) suffer from **faulty sensors, wiring problems, and PCM (Powertrain Control Module) failures**, which can be costly to diagnose and repair.

6. **Suspension and Steering Wear** The **solid rear axle** and **leaf springs** require regular attention, and **ball joints, tie rods, and control arms** wear out over time.

7. **Emissions and Modern Compliance** If you plan to drive this truck frequently in **urban areas**, you may encounter **smog check failures** due to aging emissions components (O2 sensors, EGR valves, etc.).

8. **Discomfort and Noise** The **rigid ride, loud cabin noise, and basic interior** make these trucks less comfortable than modern models with better sound insulation and ergonomics.

---

### **Ending Conclusion**

The **1999 2004 Chevrolet Silverado 1500 with a 4.8L engine** is a **capable, durable work truck** that excels in towing and hauling but comes with **significant risks**, particularly the **crankshaft failure issue**. If you find a unit with **low mileage (under 150,000 miles) and a clean service history**, it can be a **great value** especially if the owner has **replaced the crankshaft or used a known-good engine**.

However, if the truck has **high mileage (200,000 miles) without a crankshaft replacement**, the **risk of sudden engine failure is too high** unless you are prepared for a **major repair**. Even then, the **cost of maintenance** (oil leaks, transmission issues, electrical gremlins) can add up quickly.

### **Recommendation**

- **Under 150,000 miles**

- **Proper crankshaft maintenance (preferably a replacement or known-good engine)**

- **No major transmission or electrical issues**

- **A service record proving regular oil changes and gasket replacements**

** Buy it.** These trucks can be **excellent workhorses** if kept in good condition.

- **Over 200,000 miles without a crankshaft fix**

- **Visible signs of oil leaks or rough running**

- **No maintenance history or "run it until it dies" attitude from the seller**

** Avoid it.** The **risk of a sudden breakdown is too high**, and the repair costs may outweigh the truck s value.

- If you need **better reliability**, consider a **2007 Silverado with the 5.3L V8** (more durable crankshaft) or a **used diesel (Duramax or Cummins)** for long-term towing.

- If you want **lower maintenance**, a **used Ford F-150 (4.6L or 5.4L)** or **Ram 1500 (5.7L HEMI)** may be worth evaluating.

### **Final Verdict**

- **Prioritize towing capacity over long-term reliability**

- **Are prepared for maintenance and potential crankshaft repairs**

- **Find a low-mileage example with a clean history**

For **casual drivers or those seeking a trouble-free truck**, a **newer model with a more modern engine** would be the safer bet. Always **get a pre-purchase inspection** from a trusted mechanic before committing.

Details:

1999 2004 CHEVROLET SILVERADO 1500 4.8L ENGINE CRANKSHAFT 12559356 OEM NORMAL WEAR AND TEAR. FREE shipping is within the continental USA 48 States.

part #: 12559356 prices

• $25.14-$299.99

specifications cranshafengin:

• for models: 1500, Silverado
• for makes: Chevrolet
• for years: 1999-2004
• mpn: 12559356
• part type: Engine Crankshaft
• manufacturer warranty: 1 Month

shipping cranshafengin:

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

returns cranshafengin:

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

seller cranshafengin:

• rating: 99.9%
• # reviews: 68642
• city: Houston, Texas

payments cranshafengin:

• wallet: Paypal
• credit card: Visa
• other

general cranshafengin:

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

offer cranshafengin:

• sold: 0
• availability: In Stock
• quantity: 1
• started: March 16, 2026
• options: Ship-to-home

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