Detroit Tandem Rear Axles

Larger Differentials + Precision-Machined Gears = More Uptime

Detroit® continues to refine and expand its lineup of axles. New heavy-duty drive technology provides customers with the latest technology to help improve efficiency and performance.

Designed for higher torque applications, quieter operation and increased payload capacity, Detroit rear-drive axles are also easy to maintain, increasing your uptime and reducing your cost of ownership. Detroit's latest axle technology facilitates the use of faster axle ratios to support downspeeding, while our latest Axle Lubrication Management (ALM) system helps drive additional fuel-economy improvements. ALM is a feature that’s only available from Detroit, exclusively in the Freightliner Cascadia®.

Weight Ratings

34,000 lbs to 44,000 lbs

Available Ratios

2.16* to 4.778


Up to 5 years or 750,000 miles, depending on truck model and application.

New Axle Offerings

Detroit is expanding and refining its lineup of axles, delivering a completely new line of heavy-duty drive technology. These new Detroit Axles are available in all truck models.

Tandem Rear Axle Explorer

Click through the tabs below to learn more about the Tandem Rear Axle features and benefits.

Seal Design

Improved seal design for optimal leak protection.

Heavy Duty Yokes and Flanges

Added robustness to optimize drivetrain performance in down speeding applications.

Hypoid Design

Achieves maximum balance in fuel efficiency and durability.

Axle Lubrication Management 2.0

Regulates oil level at the ring gear to reduce friction and parasitic loss, extending gear life and improving fuel economy.

Model Options

Designed for construction, distribution, dump, fire and emergency, government, motor home, oil & gas, refuse, and regional. 

M2 112 Plus
M2 106 Plus
114SD Plus
108SD Plus
Western Star
Find a Dealer

Integrated Detroit Powertrain


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 Freightliner Cascadia.

Tandem Rear Axle

  • New Axles Designed for Fuel Economy: To provide optimum efficiency and performance, the Detroit Powertrain includes an all-new axle specifically designed to integrate with the downsped DD13® Gen 5, DD15® Gen 5 and DT12®, resulting in rock-solid reliability and durability.
  • Faster 6x4 Axle Ratios: The 6x4 configuration is available for applications requiring 4-wheel drive and superior traction. A variety of faster axle ratios are available, ranging from 2.41 to 2.16.
  • Faster 6x2 Axle Ratios: The 6x2 configuration boasts a 2.28 ratio, allowing the DD15 Gen 5 and DD13 Gen 5 to turn lower RPMs with the truck cruising at the same speed. It pairs perfectly with the low RPM torque curve and direct drive transmission. This means it can cruise in top gear longer, for better fuel efficiency.
  • Lighter 6x2 Axle: The 6x2 axle configuration incorporates a non-driven tag axle on the tandem, reducing total weight (by 380 lbs) and the number of moving parts, delivering better fuel economy.
  • Axle Lubrication Management (ALM2): The tandem rear axles feature an optional axle lubrication management 2.0 (ALM2) system that regulates the oil level at the ring gear and friction-loss optimized pinion bearings to reduce friction and parasitic loss, extending gear life and further improving fuel efficiency.

Steer Axle

  • Numerous Steer Axle Advantages: Detroit® steer axles offer rugged strength in a lightweight package, and integrate optimally with the other components. They are designed for the life of the axle, with multiple ratings available for tailored weight distribution.
  • Superior Maneuverability: The Detroit Powertrain's state-of-the-art steer axles provide a 55-degree wheel cut for remarkably nimble maneuvering. 
  • Needle Bearings Improve Durability: With needle bearings instead of bushings, they won't damage the king pins, and offer increased durability.


  • 2021 Greenhouse Gas-Compliant Engines: The flagship DD13® Gen 5 and DD15® Gen 5 engines are compliant 2021 Greenhouse Gas (GHG21) standards.
  • Downsped Engines = Improved Fuel Economy: The DD13 Gen 5 and DD15 Gen 5 downsped ratings 425/450/455 and 1750 lb/ft rating deliver greater horsepower and torque at lower RPMs, keeping your truck in top gear longer while cruising at more efficient engine speeds. Lower engine speeds reduce the number of fuel injections, dramatically improving fuel economy.
  • Six-Blade Engine Fan: The six-blade fan reduces power draw without sacrificing cooling capabilities.


  • Integrated Communications Benefits: The DT12® transmission links engine to axles, and communicates with the DD13® Gen 5 and DD15® Gen 5 on an integrated electronics network to share damage-reducing information such as clutch overloading and driveline protection.
  • Super-Finished Gears: Tightly-spaced 12-speed gearing, now with "super-finished" gears in the new DT12 available for the new Cascadia and Western Star 5700XE, improves low-speed maneuverability, making the Detroit Powertrain not only strong and efficient, but also smooth and safe to operate as well.
  • Intelligent Powertrain Management (IPM): The DT12 uses GPS technology and information from a topographical map to manipulate both engine and transmission functions, taking advantage of the truck's surroundings. IPM6 refines the parameters of this technology, making the truck even more capable of utilizing its surroundings efficiently.
  • Transmission Benefits: The DT12's direct drive and over drive gearing, along with eCoast, are integrated with the downsped engine — which now idles at a lower 500RPM when off-throttle — for optimized fuel economy.


  • 1-Box®The 1-Box is a complete aftertreatment emissions system that combines the SCR catalyst, the Diesel Oxidation Catalyst (DOC), Diesel Particulate Filter (DPF) and Diesel Exhaust Fluid (DEF) all into one simple component.

Brochures and Spec Sheets

Powertrain | Product Overview Guide Freightliner Cascadia | Detroit Detroit Integrated Powertrain Brochure

Connect Today

Learn more by visiting the nearest Freightliner or Western Star dealership.

Find the Nearest Dealer

Brochures and Spec Sheets

Detroit Tandem Rear Axle Product Overview Guide Detroit Axles Brochure Detroit Axles Warranty Brochure Detroit Axles Carrier Exchange Program Brochure Detroit New Tandem Axle Product Overview Guide


Detroit Axles Quality Built In Video Detroit Axle Lubrication Management (ALM) Training Video Differential Locks + Inter-axle Training Video


Detroit Tandem Rear Axle Image Detroit Tandem Rear Axle 3/4 Image Detroit Tandem Rear Axle Side Image

Detroit Connect Portal

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


All DDCSN content has been migrated to our DTNAConnect web portal. All information previously on the DDCSN is now on DTNAConnect. We have created a quick reference guide to help you locate the migrated content on DTNAConnect. Existing DDCSN login credentials will also work with DTNAConnect. Please work with your security administrators for login or content issues. If you do encounter any technical issues, please contact the Software Support Center at 855-639-8680 or


DTNA Connect Portal

DTNA Connect is the starting point for working with all brands and franchises that fall under the Daimler Truck 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