DT12 On-Highway Series: Automated Manual Transmissions

More Choice. Maximum Efficiency. 

The DT12TM On-Highway Series of automated manual transmissions builds upon the DT12’s proven reputation to provide a trio of purpose-built solutions for on-highway applications. All three models offer:

  • Cutting-edge performance
  • Enhanced fuel efficiency
  • Ease of operation for driver comfort
Brochures and Videos Maintenance Intervals and Warranties

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Transmission

DT12-HE

DT12-H

DT12-HL

Max Input Torque (lb-ft)

2,250

2,050

1,650

Overall Ratio

19

15

15

GCW Limit (lbs)

160,000

140,000

80,000

Speeds

12 forward, 4 reverse

12 forward, 4 reverse

12 forward, 4 reverse

Engine Compatibility

DD13, DD15, DD16

DD13, DD15

DD13

Truck Model Availability

Freightliner Cascadia

Freightliner Cascadia, Western Star 5700XE, Western Star 4700

Freightliner Cascadia, Western Star 5700XE

Key Feature

Designed for maximum efficiency. New design features enable further downspeeding. Increased GCW ratings and durability allow for improved on-highway capabilities.

Industry-leading AMT. Built for versatility, offering proven performance and fuel efficiency.

Built to maximize weight savings for weight-sensitive applications - up to 125 lbs lighter than the other models.

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Ultimate Efficiency: The New DT12-HE

The Detroit DT12-HE transmission is an all-new, extremely efficient option for those customers looking to reduce fuel consumption as much as possible. The DT12-HE is built for customers who demand the ultimate performance from their transmission. Design enhancements include:

*Available in 2021

The AMT Difference

 An automated manual transmission (AMT) offers the benefits of both a manual and automatic transmission. Its design uses an efficient clutch instead of a torque converter, but the clutch and shifting are handled by a computer-controlled air system. Even a novice driver can get to work with minimal effort and fuel—and maximum productivity.

The DT12 On-Highway Series transmissions provide 12 speeds for increased efficiency and flexibility. Its two-pedal design allows the driver to focus on what’s ahead instead of what’s underfoot, increasing safety and productivity. As a bonus, seamless integration with Detroit engines and safety systems promotes optimal performance.

DT12 Explorer

Click through the tabs below to learn more about the DT12 features and benefits. 

eCoast

Transmission automatically disengages when the vehicle is coasting to help maximize fuel economy.

Skip Shift

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.

Powertrain Communication

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.

Active Driveline Protection

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

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.

Total Weight

The aluminum housing and single countershaft help save weight, allowing for even more payload efficiency, while still offering excellent durability.

Power Take-Off

DT12 transmissions 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.

Truck Model Options

DT12 on-highway series transmissions vary across a range of truck models. 

Freightliner
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Cascadia®
Western Star
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5700XE
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4700
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Learn more by visiting the nearest Freightliner or Western Star dealership.

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Brochures and Spec Sheets

Detroit DT12 Brochure Detroit DT12 Driver Card DT12 2020 Sell Sheet

Videos

Detroit DT12 Fuel Economy Video Detroit Original DT12 - Downhill Overspeed Training Video Detroit New DT12 - Downhill Overspeed Training Video Detroit DT12 - Western Star Intro Training Video Detroit DT12 - Western Star Creep Mode Training Video Detroit DT12 - Western Star Hill Start Aid Training Video Detroit DT12 - Western Star Transmission Control Training Video Detroit DT12 - Western Star Kick Down Training Video Detroit DT12 - Western Star Driving Modes Training Video Detroit DT12 - Western Star eCoast Training Video Detroit DT12 - Western Star Engine Braking Training Video Detroit DT12 - Western Star CC Limit Training Video Detroit DT12 - Western Star IPM Training Video Detroit DT12 - Western Star Descent Control Training Video Detroit DT12 - Western Star Auto Neutral Training Video Detroit DT12 - Western Star Outro Training Video Detroit DT12 - Freightliner Intro Training Video Detroit DT12 - Freightliner Creep Mode Training Video Detroit DT12 - Freightliner Hill Start Aid Training Video Detroit DT12 - Freightliner Transmission Control Training Video Detroit DT12 - Freightliner Kick Down Training Video Detroit DT12- Freightliner Driving Modes Training Video Detroit DT12 - Freightliner eCoast Training Video Detroit DT12 - Freightliner Engine Braking Training Video Detroit DT12 - Freightliner CC Band Training Video Detroit DT12 - Freightliner IPM Training Video Detroit DT12 - Classic Cascadia Descent Control Training Video Detroit DT12 - Freightliner Auto Neutral Training Video Detroit DT12 - Freightliner Outro Training Video Detroit DT12 - Inclement Weather Training Video Detroit DT12 - IPM4 Training Video Detroit DT12 Product Video Detroit Intelligent Powertrain Management Video Detroit New DT12 - IPM Intro Training Video Detroit New DT12 - IPM and Cascadia Dash Display Training Video Detroit New DT12 - IPM Predictive Acceleration Mode Training Video Detroit New DT12 - IPM Crest Coast Mode Training Video Detroit New DT12 - IPM Steep Hill Crest Coast Mode Training Video Detroit New DT12 - IPM Dip Coast Mode Training Video Detroit New DT12 - IPM Driver Safety Considerations Training Video Detroit DT12 - IPM Driver Safety Considerations Training Video - Spanish Detroit DT12 - IPM Steep Hill Crest Coast Mode Training Video - Spanish Detroit DT12 - Freightliner auto neutral  Video Detroit DT12 - Video de Finalizacion Detroit DT12 - Video de formación de Freightliner -  Introduccion Detroit DT12 - Video de entrenamiento de modo de fluencia lenta  - Freightliner Detroit DT12 - Freightliner Ayuda de arranque en subida - Video Detroit DT12 - Freightliner Video de Entrenamiento Sistema Saltado de Cambios Detroit DT12 - Video de entrenamiento de control de la transmisión Freightliner Detroit DT12 - Video de entrenamiento del sistema Kick down de Freightliner Detroit DT12 - Freightliner modos de conducción - video de entrenamiento Detroit DT12 - Video de entrenamiento del sistema Rodado Economico de  Freightliner Detroit DT12 - Video de entrenamiento de frenado del motor Freightliner New DT12-HE Automated Manual Transmission Detroit DT12 - Video de entrenamiento de control de descenso Freightliner Detroit DT12 - Video de entrenamiento -  Inclemencias meteorológicas Detroit New DT12 - Video de entrenamiento de Sobrerevolucion en Descenso Detroit DT12 - Cascadia Descent Control Training Video Detroit DT12 - IPM and Cascadia Dash Display Training Video - Spanish Detroit DT12 - IPM Crest Coast Mode Training Video - Spanish Detroit DT12 - IPM Dip Coast Mode Training Video - Spanish Detroit DT12 - IPM Intro Training Video - Spanish Detroit DT12 - IPM Predictive Acceleration Mode Training Video - Spanish Detroit New DT12 - Video de entrenamiento de Sobrerevolucion en Descenso

Images

Detroit DT12 Front Image Detroit DT12 Back Image Detroit DT12 Left Profile Image Detroit DT12 Right Profile Image DT12 On-Highway Series Transmission Image DT12 On-Highway Series Transmission Back Image DT12 On-Highway Series Transmission Side Image

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