FORD 3L8Z6306AA S899 Gear Crankshaft

( Manufacturer Part Number: 3L8Z6306AA ), ( Part Type: Gear Crankshaft ), ( Ipn: S899 )

Review FORD Gear Crankshaft

The **Ford 3L8Z6306AA** is a high-performance, heavy-duty transmission gear and crankshaft assembly designed exclusively for Ford s legendary **3-speed automatic transmissions**, specifically the **3L8Z (3800) series** found in full-size trucks, SUVs, and performance-oriented vehicles like the **F-150, Expedition, Excursion, and Mustang GT**. This component represents a critical upgrade for enthusiasts seeking enhanced durability, smoother shifting, and improved torque handling, making it an ideal choice for high-performance builds, towing applications, or those looking to restore a transmission to factory or better specifications. Crafted from precision-machined **steel alloys**, the **crankshaft** within this assembly features a robust design optimized for high-stress environments, ensuring longevity even under extreme loads. The **gear set** is meticulously balanced and heat-treated to withstand the rigors of aggressive driving, heavy-duty towing, or modified engine setups, reducing wear and preventing premature failure. Whether replacing worn-out factory components or upgrading for performance, the **3L8Z6306AA** delivers a seamless fitment with OEM-level quality, backed by Ford s engineering standards. This part is particularly well-suited for applications requiring **increased torque capacity**, such as those paired with turbocharged or supercharged engines, where standard gears may struggle to maintain reliability. Built to meet or exceed original equipment specifications, it ensures compatibility with stock and aftermarket accessories, making it a versatile solution for both restoration projects and performance modifications. For drivers demanding reliability, precision, and power, the **Ford 3L8Z6306AA** gear and crankshaft assembly stands as a testament to Ford s engineering legacy, offering a balance of strength and performance that keeps transmissions running smoothly for thousands of miles.

### Pros and Cons of Buying a Ford 3L8Z6306AA Gear Crankshaft

The **Ford 3L8Z6306AA** is a transmission gear and crankshaft assembly commonly used in the **3L80E automatic transmission**, found in vehicles like the Ford F-Series, Expedition, and Lincoln Navigator. Below is a detailed breakdown of its advantages and disadvantages.

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### **Pros**

1. **Compatibility and Availability**

- The 3L8Z6306AA is a widely used part, meaning it is readily available from Ford dealerships, aftermarket suppliers, and online marketplaces. This makes sourcing relatively easy.

- It is designed specifically for the **3L80E transmission**, ensuring a proper fit without modification in most cases.

2. **Durability and Reliability**

- The 3L80E transmission is known for its robustness, especially in heavy-duty applications like trucks and SUVs. The gear and crankshaft assembly is built to handle high torque and demanding driving conditions.

- Many owners report long-term reliability if the transmission is properly maintained, including regular fluid changes and timely repairs.

3. **Cost-Effective Replacement Option**

- While not the cheapest part to replace, the 3L8Z6306AA is often more affordable than a full transmission rebuild or replacement. Purchasing a remanufactured or used unit can significantly reduce costs compared to a brand-new OEM part.

- The part is modular, meaning some components (like the torque converter or valve body) can be replaced separately, reducing overall repair expenses.

4. **Aftermarket Support**

- There are numerous aftermarket suppliers and remanufacturers that offer high-quality alternatives to the OEM part. These can sometimes provide better warranties or additional features (e.g., upgraded materials or coatings).

- Performance upgrades, such as stronger gears or modified crankshafts, are available for enthusiasts looking to enhance durability or performance.

5. **Widespread Mechanic Knowledge**

- The 3L80E transmission is a well-documented system, with many mechanics and technicians familiar with its inner workings. This means repairs and replacements are straightforward for experienced professionals.

- Diagnostic tools and repair guides are widely available, making troubleshooting easier.

6. **Potential for Long-Term Use**

- With proper maintenance, the 3L8Z6306AA and the 3L80E transmission can last well beyond 200,000 miles, especially in vehicles used for towing or heavy loads. Some units have exceeded 300,000 miles with minimal issues.

---

### **Cons**

1. **High Repair Costs**

- While individual components like the gear and crankshaft assembly may be affordable, the **3L80E transmission is complex**, and labor costs for repairs can be high. Rebuilding or replacing the entire transmission often requires specialized tools and expertise.

- If the issue stems from other components (e.g., a failing torque converter, valve body, or solenoids), the total repair bill can quickly add up.

2. **Common Failure Points**

- **Slipping gears** (often due to worn clutches or solenoids).

- **Delayed engagement or rough shifting** (common in older units or those with neglected fluid changes).

- **Leaking seals or gaskets** (leading to fluid loss and potential damage).

- **Torque converter failure** (a common and costly issue).

- The gear and crankshaft assembly itself may not fail often, but related components can lead to its premature replacement.

3. **Remanufactured Quality Variability**

- While many remanufactured 3L8Z6306AA units are high-quality, there is variability in the aftermarket. Some cheaper or poorly remanufactured parts may not last as long as OEM or reputable aftermarket units.

- It is crucial to purchase from trusted suppliers with good warranties to avoid premature failure.

4. **Complex Installation**

- Replacing the gear and crankshaft assembly requires **removing the transmission from the vehicle**, which is labor-intensive. This process often involves:

- Draining and replacing transmission fluid.

- Removing the torque converter and other related components.

- Aligning the new assembly properly to avoid shifting issues.

- DIY installation is possible for experienced mechanics, but it is a time-consuming and technically challenging task.

5. **Fluid and Maintenance Dependence**

- The 3L80E transmission is **highly dependent on proper fluid maintenance**. Using the wrong fluid or neglecting fluid changes can lead to premature wear of the gear and crankshaft assembly, as well as other components.

- Many owners report that failing to change the fluid regularly is the primary cause of transmission issues.

6. **Potential for Hidden Damage**

- If the transmission has been abused (e.g., excessive towing without proper fluid, overheating, or neglect), the gear and crankshaft assembly may appear fine on the surface but could have internal damage (e.g., worn bearings, cracked gears, or misaligned components).

- A thorough inspection by a professional is recommended before purchasing a used or remanufactured unit.

7. **Limited Longevity in Severe Conditions**

- While the 3L80E is durable, it is not designed for extreme conditions like **constant towing of heavy loads, off-roading, or extreme temperatures**. In such cases, the gear and crankshaft assembly may wear out faster, requiring more frequent replacements.

---

### **Conclusion**

The **Ford 3L8Z6306AA gear and crankshaft assembly** is a critical and widely used part for the 3L80E transmission, offering **reliability, compatibility, and availability** when properly maintained. Its durability makes it a solid choice for vehicles that require a robust transmission, particularly in heavy-duty applications. However, the **high repair costs, potential for common failure points, and complexity of installation** must be carefully considered.

For most owners, the **pros outweigh the cons** if the transmission is well-maintained, and the part is sourced from a reputable supplier. The key to maximizing the lifespan of the 3L8Z6306AA and the 3L80E transmission lies in **regular fluid changes, timely repairs, and avoiding excessive strain on the system**.

---

### **Recommendation**

- Purchase the **3L8Z6306AA from a trusted supplier**, such as an OEM dealer, a well-reviewed remanufacturer, or a reputable aftermarket parts store. Look for parts with **warranties** (e.g., 1-year or lifetime warranties) to ensure quality.

- If buying used, have a **transmission specialist inspect the part** for signs of wear or damage before installation.

- **Change the transmission fluid every 30,000 60,000 miles** (or as recommended by Ford) to prevent premature wear. Use **Mobil ATF LT 71142 or a high-quality synthetic alternative**.

- Address **any shifting issues, leaks, or unusual noises** promptly to avoid further damage.

- While experienced DIYers may attempt the installation, **professional transmission repair shops** are often better equipped to handle the complexity of the 3L80E. This ensures proper alignment and reduces the risk of future problems.

- If you frequently tow heavy loads or drive in extreme conditions, consider **upgraded components** such as a **stronger torque converter, modified valve body, or performance fluid**. These can extend the life of the gear and crankshaft assembly.

- Be prepared for **related repairs** (e.g., torque converter, solenoids, or seals) that may be needed alongside the gear and crankshaft replacement. A full transmission rebuild may be necessary if the unit is severely worn.

- Watch for **slipping gears, delayed engagement, grinding noises, or fluid leaks**, as these are early indicators of potential issues with the gear and crankshaft assembly or other transmission components.

---

### **Final Verdict**

The **Ford 3L8Z6306AA gear and crankshaft assembly** is a **solid, reliable choice** for the 3L80E transmission when purchased from a reputable source and maintained properly. Its **durability and widespread availability** make it a practical option for Ford owners, but **proactive maintenance and careful sourcing** are essential to avoid costly failures. For most drivers, the benefits of this part justify the investment, provided that the transmission is well-cared-for.

Details:

Engineered with a factory-like design for effortless installation, ensuring perfect match your vehicle. Engineered using the latest technology to ensure product lasts longer in service. 3L8Z6306AA Gear Crankshaft for Ford: Part Number: Manufacturer: Ford. Designed specifically for trucks, trailers, and buses.

Manufactured following strict OE standards to work like the original component. Made of high-quality components for durability, reliability, and performance.

part #: 3l8z6306aa prices

• $46.31-$69.55

specifications cranshafengin:

• for makes: Ford
• mpn: 3l8z6306aa
• part type: Gear Crankshaft
• ipn: S899

returns cranshafengin:

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

seller cranshafengin:

• # reviews: 69679
• rating: 99.4%
• city: Los Angeles, California

payments cranshafengin:

• wallet: Google-pay
• other
• credit card: Mastercard

general cranshafengin:

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

offer cranshafengin:

• started: May 3, 2026
• options: Ship-to-home
• availability: In Stock
• quantity: 4
• sold: 0
• best offers: True

shipping cranshafengin:

• class: Standard
• transit: 3-6 Days
• service: Standard
• type: Fixed
• cost: $0.00

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