What is an Automated Manual Transmission?

In the realm of long-haul and over-the-road trucks, Automated Manual Transmissions (AMTs) have become a standard feature, revolutionizing the driving experience for many. While often associated with class 8 on-highway trucks, many vocational and severe service trucks have yet to fully embrace this technology. Let’s explore the fundamentals, functions, and benefits of Automated Manual Transmissions, offering valuable insights for fleets considering the switch.

What’s the Difference Between AMTs and Other Transmissions? 

In a manual transmission, drivers actively engage in gear changes, managing the clutch pedal and gear shifter while navigating the route. Torque converter-based automatic transmissions, on the other hand, handle shifts automatically without driver intervention, but can be less fuel efficient and come with a higher price tag. 

Automated Manual Transmissions offer a middle ground, utilizing a manual gearbox with electronic control for clutch engagement and gear changes. This hybrid approach aims to improve fuel efficiency while providing drivers with manual control when needed.[RKE1]

Automated Transmissions – such as the Endurant HD series and Endurant XD series – take it a step further in design innovation. These transmissions’ design is not rooted in a manual transmission but is designed from the ground up to be automated enabling engineers to optimize the transmission’s weight, dimensions, and features for extreme efficiency, reliability, and performance..

Pros and Cons of Automated Manual Transmissions

• AMTs contribute to better fuel economy by optimizing gear shifts, reducing engine strain, and lowering overall fuel consumption. This, in turn, leads to a decrease in greenhouse gas emissions, addressing environmental concerns.
• AMTs also ensure consistent performance across drivers. They provide excellent control, especially on grades so that drivers, whether new or experienced, can use the truck to get the job done.
• AMTs increase the driver pool and reduce the amount of time that it takes to learn how to operate the truck.
• AMTs reduce wear and tear on components like the clutch and transmissions internals. Longer component life means fewer replacements which ultimately means reduced maintenance costs.
• However, in certain driving conditions (such as stop-and-go traffic), AMTs can be less efficient due to frequent clutch engagement. 
• Automated Manual Transmissions have more components than traditional manual transmissions, including electronic sensors, actuators, and control units so repairs may require specialized knowledge and diagnostic tools, which can be a challenge for smaller repair shops.
• Drivers accustomed to manual transmissions may need time to adapt to AMTs. The lack of a clutch pedal and computer-controlled shifting can feel unfamiliar. However, once a driver gets used to operating a truck with an Automated Manual Transmission, they are typically reluctant to go back to a manual transmission. Many fleets have even seen an improvement in driver retention due to increased satisfaction and reduced fatigue.[RKE3] [TJ4]

How Has Automated Transmission Technology Evolved?

Over the years, Automated Manual Transmissions have evolved from semi-automated systems requiring manual clutch use for starts and stops to sophisticated, fully automated solutions like the Eaton Cummins Endurant HD series and Endurant XD series, Detroit DT12, Volvo I-Shift, and International T14 that deliver car-like driving convenience.

Consumer Preferences and Market Trends

Several factors including the ongoing driver shortage and government fuel economy regulations have increased consideration and adoption of AMTs. Today, commercial vehicle OEMs consistently report take-rates for new long-haul/over-the-road builds solidly around the 75% mark, with some even exceeding 80%. Class 8 vocational sales have also been rapidly gaining ground in recent years.

What’s the Bottom Line on Automated Manual Transmissions?

As Automated Transmissions continue to shape the landscape of the trucking industry, understanding their fundamentals and benefits becomes crucial. From improved fuel efficiency to reduced environmental impact, the adoption of AMTs holds promise for a more efficient and sustainable future in commercial transportation.