THE DT12 VOCATIONAL SERIES

Rugged, reliable and ready to work.

Performance and durability under extreme conditions. That’s what the Detroit^® DT12^® Vocational Series transmissions bring to every job. Our two vocational models – the DT12-V and DT12-VX – are now available in the Western Star 47X, Western Star 49X and Freightliner Plus-series trucks. No road, trail or work site is too extreme for these sturdy, reliable Detroit transmissions to handle.

New vocational features
Increased application coverage
Ease of operation for driver comfort

Maintenance Intervals and Warranties

TRANSMISSION

DT12-V

DT12-VX

DT12-HL

TORQUE RATING

2,250 (LB-FT)

2,500 (LB-FT)

1,650 (LB-FT)

OVERALL RATIO

19

16

15 GCW LIMITS

160,000

275,000

80,000

SPEEDS

12 Forward, 4 Reverse

ENGINE COMPATIBILITY

DD13, DD15, DD16

DD13

TRUCK MODEL AVAILABILITY

WESTERN STAR 47X, WESTERN STAR 49X, Freightliner M2 112 Plus, Freightliner 114SD Plus

WESTERN STAR 49X, Freightliner M2 112 Plus, Freightliner 114SD Plus

Freightliner 114SD Plus

KEY FEATURE

Rugged and durable. Engineered to haul loads and take on job sites in tough conditions.

Tough gets tougher. Built for the extreme demands of oil fields, mining sites, logging trails and beyond.

BUILT TO MAXIMIZE WEIGHT SAVINGS FOR WEIGHT-SENSITIVE APPLICATIONS - UP TO 125 LBS LIGHTER THAN THE OTHER MODELS.

RAISING THE BAR ON DURABILITY: THE DETROIT DT12 VOCATIONAL SERIES

Large, robust gears for tough jobs. The DT12-V and DT12-VX feature large, robust gears that allow for increased gross combination weight (GCW) and input torque. Thousands of hours of rigorous testing have made the DT12-V and DT12-X transmissions purpose-built to take on rugged environments.
An improved oil system design. A new oil pump provides a more continuous flow of oil at all speeds and operating conditions. Its bottom-mounted oil intake also allows oil to be picked up at the lowest level and sprayed onto the gear mesh, ensuring ample lubrication in tough conditions—and less parasitic loss due to oil splash.
Enhanced thermal management for greater reliability. The oil cooler’s adaptive bypass valve maintains oil at an optimal temperature for any running application. This cools oil when it’s needed and bypasses when it’s not.
Bottom PTO capability for increased application coverage. In addition to rear power take-off (PTO), the Bottom PTO capability of the DT12 Vocational Series transmissions provides flexibility and dependable performance for any industry, from heavy haul to logging, construction, farming, mining and oil. Dual PTO usage (bottom and rear) opens up even more ways to work.

NEW VOCATIONAL FEATURES: OPTIMIZED FOR EXTREME

Performance on demand.

Off-Road Mode features shift maps that give you peak performance on any terrain.
Rock-Free Mode helps you avoid wheel-stuck situations by using the accelerator to rock the vehicle free.
Paver Mode allows a dump truck to shift from neutral to drive without pressing the brake pedal while moving away, ensuring a steady flow to the paving machine.
Power Launch automatically increases engine speed for smooth, powerful take-offs with heavy loads – all while protecting the clutch and driveline.
Hill Start Aid (HSA) feature prevents rollback for up to 3 seconds when transitioning from a standstill to acceleration on a grade of 3% or more. The ABS module holds and modulates brake pressure after the driver has released their foot from the brake pedal, preventing the truck from rolling backwards for 3 seconds. This feature provides added safety and increases driver confidence.

A superior power launch option.

The Power Launch feature automatically increases engine speed to 1,200 RPM to ensure smooth, powerful take-offs with heavy loads—all while protecting the clutch and driveline.

More Specs and Details

AMT: POWER MEETS SIMPLICITY

As automated manual transmissions (AMT), the DT12-V and DT12-VX combine the benefits of manual and automatic designs. With computer-controlled shifting and clutch engagement, only two pedals are needed to operate the truck: the brake and accelerator. Even a less experienced driver can get to work with minimal effort, maximum productivity and all the power you need.

DT12 Vocational Series transmissions offer the ideal blend of technology and toughness. They’ve been tested for thousands of miles with precise engineering for jobsite environments, and provide 12 speeds for increased efficiency and flexibility. Also, seamless integration with Detroit engines and safety systems promotes optimal performance that you can’t get anywhere else. All told, these transmissions are equipped to meet any challenge you face.

More Specs and Details

Truck Model Options

DT12 Vocational Series transmissions vary across a range of truck models.

Freightliner

Western Star

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Detroit Connect Virtual Technician

Don’t let maintenance issues stop productivity in its tracks. Detroit Connect Virtual Technician^® remote diagnostics system has your back. When it triggers a fault code, it tells you what it is, and how serious it is—as well as where, when and how to fix the issue. It keeps you informed, so you can make better maintenance decisions and get back to work faster.

Connect Today

Learn more by visiting the nearest Western Star dealership.

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Extensive Parts Availability

Trained technicians are ready to serve you and your DT12 Vocational Series transmissions at any of our 800+ authorized Detroit locations across the highways and back roads of North America.

Parts & Service