CHEVROLET TRUCK 303.GM8M03 Gm Ls Crankshaft 5.3L 6.0L 24X

( Brand: Chevrolet Truck ), ( Part Type: Crankshaft ), ( Conditions Options: 5.3l 6.0l Ls Gen Iii 24x ), ( Genuine Oem: Yes ), ( Ipn: 303.gm8m03 )

Review CHEVROLET TRUCK Gm 5.3l 6.0l Ls Gen 24x Tooth Crankshaft fits 303 2003

The **Chevrolet 303.GM8M03 GM 5.3L/6.0L LS Gen II 24x Crankshaft** is a high-performance, precision-engineered component designed to elevate the power, reliability, and longevity of General Motors iconic **5.3L V8 (LQ9/LQ4)** and **6.0L V8 (LS1/LSA)** engines, particularly those from the **Gen II LS platform** (2004 2013). This **24x crankshaft** is meticulously crafted to deliver superior balance, durability, and performance enhancements over stock GM cranks, making it an ideal choice for enthusiasts seeking to push their engines beyond factory limits. Engineered from **high-grade forged steel** and dynamically balanced to exacting tolerances, this crankshaft is built to withstand the extreme stresses of high RPM, forced induction, or aggressive tuning without compromising structural integrity. Whether installed in a **street rod, muscle car, truck, or performance cruiser**, this crankshaft provides a robust foundation for increased horsepower, smoother operation, and extended engine life critical for those chasing **big power with big reliability**. Its **24x configuration** (24 bolts) ensures a secure, vibration-dampening fit, reducing crankshaft windage and improving overall engine efficiency. Perfect for applications ranging from **stock swaps and restorations** to **high-performance builds with turbocharging, nitrous, or supercharging**, this crankshaft is a game-changer for anyone looking to maximize their LS engine s potential while maintaining the durability of a professionally engineered component. Built to meet or exceed OEM specifications while incorporating advanced manufacturing techniques, it s the ideal upgrade for builders who demand **precision, strength, and performance** in every detail.

### **Pros and Cons of Buying a Chevrolet 303 (GM 5.3L/6.0L LS Gen 2 Crankshaft) Truck**

#### **Pros**

1. **Proven Reliability** The LS engine family (including the 5.3L and 6.0L) is well-known for durability, especially when maintained properly. Many units exceed 300,000 miles with basic care.

2. **Strong Performance** The 6.0L (L96) is a high-performance variant with a forged crankshaft, allowing for significant power gains with tuning. The 5.3L (LQ9) is a more fuel-efficient but still capable engine.

3. **Aftermarket Support** Both engines have extensive aftermarket parts, including performance upgrades, engine swaps, and custom tuning options. The LS platform is highly modifiable.

4. **Fuel Efficiency (Compared to V8s)** The 5.3L V8 is more efficient than traditional big-block engines, offering better MPG than older GM V8s while still providing strong torque.

5. **Availability of Parts** Since these engines were widely used in trucks, SUVs, and performance cars, finding replacement parts is relatively easy.

6. **Potential for Engine Swaps** The LS platform is popular for engine swaps into other vehicles (e.g., Mustangs, Camaros, or even foreign cars), increasing resale value for well-maintained units.

7. **Lower Running Costs (If Maintained)** With proper oil changes and cooling system care, these engines can be cost-effective to operate compared to some modern turbocharged engines.

8. **Classic GM Build Quality** Early LS engines (especially Gen 2) were built with solid materials, making them more robust than some later iterations with cost-cutting measures.

---

#### **Cons**

1. **Potential for Internal Wear** The crankshaft in question (GM 5.3L/6.0L Gen 2) may have signs of wear, such as rod bearing or main bearing failure, which can be expensive to repair if neglected. Always check for oil consumption, unusual noises, or past maintenance records.

2. **Oil Consumption Issues** Some LS engines, especially the 6.0L, are known for burning oil if not properly maintained. This can lead to frequent oil changes and potential long-term damage if ignored.

3. **Cooling System Vulnerabilities** The LS engine relies heavily on proper cooling. Head gasket failures, thermostat issues, or water pump failures can lead to catastrophic engine damage if not addressed promptly.

4. **Electrical and Computer Reliance** Modern LS engines are computer-controlled, meaning diagnostic trouble codes (DTCs) can be common if sensors fail or wiring is damaged. This requires occasional scanning and repairs.

5. **Fuel System Concerns** The 5.3L (LQ9) uses a fuel-injected system that can develop clogs or injector issues over time. The 6.0L (L96) has a more robust fuel system but still requires attention.

6. **Transmission Compatibility** If the truck has an automatic transmission (e.g., 4L60, 4L65, or 4L85), these can be prone to failure if not properly serviced. Manual transmissions (4L60E, 4L70) are more durable but require more maintenance.

7. **Emissions and Modern Compliance** Some older LS engines may not meet modern emissions standards if modified heavily, which could complicate registration or insurance in certain states.

8. **Potential for Rod Bearing Failure** The crankshaft in question may have been in a high-stress application (e.g., heavy towing, forced induction, or high RPMs). Rod bearings can wear out prematurely if the engine was not properly supported.

9. **Resale Value Depreciation** While LS engines are reliable, the truck itself may depreciate faster than newer models, especially if it lacks modern safety or fuel-efficiency features.

10. **Labor and Repair Costs** If the engine or drivetrain fails, repairs can be expensive, particularly if specialized parts (e.g., LS-specific components) are required.

---

### **Conclusion and Recommendation**

The **Chevrolet 303 with a GM 5.3L/6.0L LS Gen 2 crankshaft** is a strong choice if you prioritize **durability, performance, and modifiability**. These engines are well-suited for **towing, hauling, or high-performance applications** when properly maintained. However, they require **attention to oil changes, cooling system health, and potential electrical issues** to avoid costly failures.

- You want a **reliable, high-performance truck** with strong aftermarket support.

- You plan to **modify the engine** (tuning, forced induction, or engine swaps).

- You can **afford regular maintenance** (oil changes, cooling system checks, transmission service).

- You find a **well-documented unit** with **no major history of neglect** (check for oil leaks, rod knock, or overheating issues).

- You want a **low-maintenance, plug-and-play** vehicle with minimal upkeep.

- The truck has a **history of poor maintenance** (e.g., no oil changes, overheating, or rough running).

- You **cannot afford potential repairs** (e.g., rod bearings, head gaskets, or transmission failures).

- You live in an area with **strict emissions laws** and plan heavy modifications.

If you **inspect the engine thoroughly** (listen for rod knock, check oil consumption, verify cooling system health, and review maintenance records), a **5.3L or 6.0L LS Gen 2 truck can be an excellent purchase**. Consider **budgeting for potential repairs** (especially bearings, cooling components, and transmission service) and **prioritize units with a clean history**. If you re comfortable with **regular maintenance and occasional upgrades**, this engine is a **great choice for performance and durability**. If you prefer **hassle-free ownership**, a newer truck with a turbocharged or diesel engine may be a better fit.

Details:

5.3L 6.0L LS GEN III 24X GM Chevrolet Tooth Crankshaft. Some items do have more wear than others.

part #: 303.gm8m03 price

• $130.00

specifications cranshafengin:

• for makes: Chevrolet
• for years: 2003
• brand: Chevrolet Truck
• part type: Crankshaft
• conditions options: 5.3l 6.0l Ls Gen Iii 24x
• genuine oem: Yes
• ipn: 303.gm8m03

offer cranshafengin:

• options: Ship-to-home
• availability: In Stock
• sold: 0
• best offers: True
• quantity: 1
• started: June 10, 2026

returns cranshafengin:

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

seller cranshafengin:

• rating: 99.7%
• # reviews: 17327
• city: Easley, South Carolina

payments cranshafengin:

• wallet: Apple-pay
• credit card: Visa
• other

shipping cranshafengin:

• cost: $75.00
• carrier: FedEx
• transit: 3-8 Days
• service: FedEx Ground / FedEx Home Delivery
• type: Fixed
• class: Standard

general cranshafengin:

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

Chevrolet Truck 1193894 Is Similar To:

• 1046162 213-152 Original Gm Oem Engine Crankshaft Position Sensor Fits Chevrolet Oldsmobile (25.9% similar) Comes with a 30 day warranty. Warranty applies to parts that arrive defective damaged incorrect or become within the period...(June 18th, 2018)
• 12460 Standard Crankshaft Chevrolet Cavalier (26% similar) 4 cylinder engines this factory remanufactured by standard crankshaft corporation. Great for an engine rebuild...(December 29th, 2017)
• 12551485 Chevrolet Lt4 Crankshaft P-n (41.4% similar) Some discoloration on bearing journal 5 but surface finish is still perfect. Same crank that was used in the limited edition ZZ430 crate engine. This was removed from an LT4 crate engine that never started. Impala Camry fire bird SS Z28 formula trans am caprice road master nova Malibu Monte Carlo ...(February 6th, 2018)
• 12552216 Gm Chevrolet Gen Iii (31.5% similar) To ask a question about this item, please on at bottom left of page. LY6 LY5 LH6 remanufactured crankshaft kit thumbnails to 1 remanufactured 020 undersized casting number is and crank has 58 tooth rector wheel. 3 engine no core deposit or exchange required...(August 31st, 2017)
• 12553482 Gm Chevrolet Gen Iii (31.5% similar) 8 engine no core deposit or exchange required. 020 undersized casting number is and crank has 24 tooth rector wheel. To ask a question about this item, please on at bottom left of page. After 25 years experience in the core business working a family and corporate world i'ventured out on my own ...(August 2nd, 2017)
• 12578072 Gm Chevrolet Gmc Genuine Crankshaft Balance Colorado Canyon (39.5% similar) Shipping carrier substitutions may be made at our determination in an attempt to reduce cost the customer. Electrical parts are not returnable...(May 20th, 2018)
• 12588034 Chevrolet 3.4 V6 Crankshaft (43.5% similar) Balance pulley with bolts in excellent condition from 2008 equinox will fit many others...(February 6th, 2018)
• 12588612 Chevrolet Performance Crankshaft Nodular Cast Iron Stroke (33.1% similar) This crank should probably be machined before installing into a engine, cheap and no problem to have done. Its a 24T rector and the sprocket on front is in good condition...(July 8th, 2018)
• 12635649 Chevrolet Gm Gen Iii Iv Harmonic Balancer (38.8% similar) Harmonic balance Chevy LS3 take off...(April 18th, 2018)
• 13672019 Aftermarket Products New Crankshaft Position Sensor Chevy Chevrolet Tracker Suzuki (27.1% similar) The items are brand new parts that look and fit same as original, except at a much better price...(October 22nd, 2018)
• 14022672 Gm New Oem Crankshaft Pulley Bolt Chevrolet Avalanche Blazer Express (24.4% similar) Manufacturer part number: identified in schematic if applicable...(September 25th, 2018)