An automated manual transmission (AMT) combines a traditional clutch-actuated manual gearbox with a computer-controlled shift actuator and clutch. The best shift patterns are selected electronically to provide optimal power and fuel efficiency.Brochures and Videos Maintenance Intervals and Warranties
An AMT is a proven technology used around the world. With computer-controlled shifting and clutch engagement, only two pedals are needed to operate the truck: the brake and accelerator. This makes the truck easier to operate and ideal for drivers of all experience levels.More Specs
Your fleet’s profitability depends on boosting fuel economy and increasing durability. Our engineers have looked at every opportunity to reduce fuel consumption and increase efficiency. They’ve built sturdy components and designed the DT12 to operate with limited wear and tear.
With more new drivers coming into the market, it’s critical to ensure your fuel economy goals are met and your trucks continue to last for years to come. With our easy-to-operate AMT transmission, drivers reach their optimal performance sooner, saving you money on fuel and improving driver comfort.
When combined with a specially-designed driver interface with enhanced cruise control, drivers have plenty of ways to further improve their fuel efficiency.
Detroit transmissions are spec’d, sold and serviced by an unmatched network of knowledgeable salespeople and expert factory-trained technicians at hundreds of Freightliner dealers throughout the United States and Canada.
Detroit offers outstanding parts availability and transmission owners also enjoy comprehensive warranty coverage — including fast, hassle-free processes — and expedited parts and service for critical downtime situations. Our transmissions come with the following standard warranty: DT12 GCW greater than 110,000 lbs.: 5 years / 500,000 miles; DT12 GCW less than or equal to 110,000 lbs.: 5 years / 750,000 miles. (and 3-year/350,000-mile standard warranty on the clutch).
Click through the tabs below to learn more about the DT12 features and benefits.
Transmission automatically disengages when the vehicle is coasting to help maximize fuel economy.
The Transmission Control Module (TCM) sends electronic commands to “skip” unnecessary gears, helping increase acceleration to achieve cruising speed quickly and smoothly, and allowing the driver to accelerate in the appropriate “start gear” based on load and grade.
A Common Powertrain Controller (CPC) optimizes high-speed communication between the Motor Control Module and the Transmission Control Module, improving operational efficiency throughout the entire powertrain.
The Transmission Control Module (TCM) calculates the torque wind-up in the driveline and regulates with engine torque control for enhanced driving comfort and less driveline wear.
Intelligent Powertrain Management (IPM) pinpoints the truck's location and looks over a mile ahead to anticipate terrain. IPM will adjust cruise control, pre-select gears, eCoast and brake the engine to maximize efficiency into the road conditions ahead.
The aluminum housing and single countershaft help save weight, allowing for even more payload efficiency, while still offering excellent durability.
DT12 tranmissions are available with a proprietary rear-mount-only Power Take-Off (PTO) that may allow customers in the bulk-haul tractor/trailer market to operate applications using liquid trailers, dry goods, wet goods, and moving floors.
The Integrated Detroit™ Powertrain delivers the performance and dependability you need to run your business efficiently. Detroit has designed, engineered and manufactured the engine, transmission and axles to work together seamlessly, providing the optimal powertrain solution for your business needs. The Integrated Detroit Powertrain is available in the new Freightliner Cascadia, the original Freightliner Cascadia Evolution and the Western Star® 5700.
If maintenance issues come up on the road, you can count on Detroit Virtual Technician remote on board diagnostics system to let you know how serious the fault code is, where the nearest part you need is located, and when you can get into the next available service bay, and then it can even schedule your repair appointment for you.
Learn more by visiting the nearest Freightliner or Western Star dealership.Find Nearest Dealer
The Detroit™ Connect portal is easy-to-use, one-stop-shop for all vehicle performance data gathered, transmitted and analyzed by Detroit Connect. The portal gives you access to insights delivered by Detroit Connect Virtual Technician℠. The Detroit Connect portal will also give you access to new features, such as Remote Updates, and Analytics, available late 2017.Detroit connect portal login
DDCSN serves as both a public customer website and secure service portal to access DETROIT branded product service and parts information, tools, training, and more. Here you can access a wide range of product literature such as operator mauals, warranty booklets, and even service bulletins. You can also find parts catalogs, sales and marketing programs, webinars, and much more.DDCSN Login
DTNA Connect is the starting point for working with all brands and franchises that fall under the Daimler Trucks North America umbrella: Detroit, Thomas Built Buses, SelecTrucks, Sterling, Freightliner, and Western Star. Here, you can access the full spectrum of online applications, resources and tools you need. Whether you use DTNA online resources to complete repairs, purchase parts, submit warranty claims, spec new vehicles or track the status of your truck orders, DTNAConnect streamlines the tasks and activities that are part of your daily work routine.DTNA Connect Portal Login