Upgrading to a 68RFE Transmission: What You Should Know

 Upgrading to a 68RFE Transmission: What You Should Know

The 68RFE transmission is a widely used automatic transmission, particularly in heavy-duty trucks like the Dodge Ram series equipped with Cummins diesel engines. Its design and features make it capable of handling high torque loads, but its performance and durability under such conditions depend on several factors, including the modifications and usage scenarios.

Upgrading to a 68RFE Transmission: What You Should Know Before the Swap

The decision to upgrade to a 68RFE transmission involves several considerations to ensure the swap meets your needs. Below is a comprehensive guide to help you make an informed choice:

Design Overview of the 68RFE Transmission

The 68RFE transmission is a six-speed automatic transmission introduced by Chrysler in 2007. It was designed specifically to work with high-output engines, such as the 6.7L Cummins diesel engine. Key features include:

  1. Torque Converter: The 68RFE employs a lock-up torque converter to minimize slippage and improve efficiency, especially under heavy loads.

  2. Gear Ratios: The transmission’s gear ratios are optimized for a balance between towing capability, fuel efficiency, and performance.

  3. Clutch Packs: The transmission uses multiple clutch packs to handle varying levels of torque in different gears.

  4. Hydraulic Control System: The advanced hydraulic system ensures smooth shifts and precise control under various driving conditions.

Strengths of the 68RFE Under High Torque Loads

  1. Torque Handling Capability:

    • The stock 68RFE is rated to handle torque outputs up to 800 lb-ft. This makes it suitable for many heavy-duty applications without requiring immediate upgrades.

    • The use of steel clutch packs and a robust planetary gear set contributes to its ability to manage high torque.

  2. Thermal Management:

    • The transmission’s design includes an efficient cooling system to dissipate heat generated during high-load conditions, such as towing heavy trailers or operating in hot climates.

  3. Adaptive Learning Technology:

    • The 68RFE is equipped with an adaptive learning system that adjusts shift timing and pressure based on driving habits. This ensures smoother operation and reduced wear over time.

Common Challenges Faced by the 68RFE

Despite its strengths, the 68RFE is not without its limitations, especially when subjected to extreme torque loads:

  1. Clutch Wear:

    • Under prolonged high torque conditions, the stock clutch packs can wear out, leading to slipping and reduced efficiency.

  2. Hydraulic Pressure Issues:

    • The stock hydraulic system may struggle to maintain consistent pressure under extreme loads, affecting shift quality and overall performance.

  3. Overheating Risks:

    • Without adequate cooling upgrades, the transmission is prone to overheating, which can degrade internal components and reduce its lifespan.

  4. Torque Converter Failures:

    • The stock torque converter may not be sufficient for applications with torque outputs exceeding its rated capacity, leading to potential failures.

Upgrades to Improve 68RFE Performance

To ensure the 68RFE performs reliably under high torque loads, several upgrades can be implemented:

  1. Aftermarket Clutch Packs:

    • Upgrading to high-performance clutch packs, such as those made from carbon or Kevlar materials, can significantly enhance torque capacity and durability.

  2. Valve Body Upgrades:

    • Installing an upgraded valve body can improve hydraulic pressure control, ensuring consistent and precise shifts even under heavy loads.

  3. Torque Converter Replacement:

    • A heavy-duty torque converter designed for high torque applications can handle greater stress and improve power transfer efficiency.

  4. Transmission Coolers:

    • Adding a high-capacity transmission cooler helps manage heat buildup, reducing the risk of overheating and extending the transmission’s lifespan.

  5. Tuning and Programming:

    • Custom transmission tuning can optimize shift points and line pressure for specific performance needs, ensuring the transmission operates within safe limits.

Maintenance Tips for Long-Term Reliability

Proper maintenance is essential to keep the 68RFE performing well under high torque loads. Key maintenance practices include:

  1. Regular Fluid Changes:

    • Using high-quality ATF+4 transmission fluid and adhering to recommended change intervals helps maintain lubrication and cooling efficiency.

  2. Monitoring Transmission Temperature:

    • Installing a temperature gauge allows drivers to monitor transmission heat levels and take corrective action when necessary.

  3. Periodic Inspections:

    • Regularly inspecting the transmission for signs of wear, leaks, or damage can prevent small issues from becoming major problems.

  4. Avoiding Excessive Load Stress:

    • While the 68RFE is designed for heavy-duty use, avoiding excessive loads or aggressive driving can extend its service life.

Real-World Performance

The 68RFE’s performance under high torque loads has been well-documented by truck owners and industry professionals. In stock form, it handles everyday towing and hauling duties effectively. However, for applications involving extreme torque levels—such as modified Cummins engines producing over 1,000 lb-ft of torque—upgrades become essential.

For example, a Dodge Ram owner using their truck for competitive towing may find the stock 68RFE inadequate. By upgrading the clutch packs, torque converter, and adding a performance cooler, the transmission can handle significantly higher torque levels without failure.

Conclusion

 

The 68RFE transmission is a capable and reliable unit for handling high torque loads, particularly in stock applications. Its design incorporates features that support heavy-duty use, but its limitations become apparent when pushed to extreme levels. Through a combination of strategic upgrades and diligent maintenance, the 68RFE can be transformed into a robust and durable transmission, capable of withstanding even the most demanding conditions. Whether used for daily hauling or extreme performance, proper care and enhancements ensure it stands up to the challenge.

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