68RFE TRANSMISSION

Where it all began & where it is going

The 68RFE automatic transmission is a significant development in the automotive world, reflecting advances in technology, design, and functionality tailored to meet the evolving demands of both vehicles and their drivers. Introduced by Chrysler in 2007, the 68RFE was designed as a robust, reliable transmission option for the heavy-duty Ram trucks, particularly those equipped with the Cummins diesel engine. Its name, "68RFE," reflects its design characteristics: "6" stands for six forward gears, "8" indicates that it is an 800 ft-lb class transmission, "R" stands for rear-wheel drive, and "FE" stands for fully electronic control.

The Genesis of 68RFE

The 68RFE transmission's development was driven by the need for a transmission that could handle the increased torque outputs of modern diesel engines while providing smooth operation and improved fuel efficiency. Before its introduction, many heavy-duty trucks relied on transmissions that were not fully optimized for the power and efficiency modern engines were capable of delivering.

Chrysler's response was to design the 68RFE, leveraging the architecture of its predecessor, the 48RE transmission, but significantly re-engineering it to handle more power and to offer six-speed capability. This was achieved through the incorporation of advanced materials, improved hydraulic controls, and a sophisticated electronic control unit (ECU) that could adjust shifting patterns for optimal performance and fuel efficiency.

Design and Features

At the heart of the 68RFE's design is its fully electronic control system, which allows for precise management of the transmission's operation. This system adjusts the shifting strategy based on a variety of factors, including load conditions, driving style, and even altitude, ensuring that the vehicle always operates at peak efficiency.

The transmission features six forward gears, with a wide gear ratio spread that allows for both aggressive low-end performance and relaxed high-speed cruising. This versatility makes the 68RFE particularly well-suited for heavy-duty applications, including towing and hauling heavy loads, where it can leverage its low-end torque for better acceleration while maintaining fuel efficiency at highway speeds.

Another key feature of the 68RFE is its use of a triple-disc torque converter. This design enhances the transmission's ability to manage the high torque outputs of diesel engines, providing smoother shifts and reducing wear on the transmission components over time.

Impact and Legacy

Since its introduction, the 68RFE has become a staple in the heavy-duty truck segment, praised for its durability, reliability, and performance. It has undergone various updates and improvements over the years to enhance its capabilities and to address the needs of newer engine technologies and vehicle designs.

The 68RFE transmission's development marked a significant step forward in the evolution of automatic transmissions for heavy-duty applications. It showcased the automotive industry's ability to innovate and adapt to the changing needs of both consumers and the environment, offering a blend of performance, efficiency, and durability that has set a standard in the segment.

The legacy of the 68RFE is evident in its widespread use and continued relevance in the automotive industry, highlighting the importance of continuous improvement and innovation in meeting the challenges of modern vehicle design and performance requirements.