// 49X

Introducing what isn’t just the best truck we’ve ever built, but what might be the best truck anyone has ever built.


The entire X-Series line of trucks was built from the ground up to bring toughness into the modern age with an impressive collection of engineering, technology and more than half a century of experience building trucks that take on any challenge, anywhere. So, whether you need a rugged vocational truck or a semi truck, and whether you’ve owned Western Star for years or will for the first time, it’s time to break new ground with the 49X.



Leading the industry in vocational truck safety

The safest and most advanced truck we’ve ever built.

Detroit Assurance Suite of Safety Systems

Internally mounted protection from the elements. Greater durability to prevent sagging — a common problem with piano hinges.

Introducing Detroit Assurance

Technology gets tough in the 49X, the first Western Star to feature the most advanced suite of active safety systems ever offered to the vocational market – Detroit Assurance. But it not only helps keep people safe, it helps you reduce the repair and operational costs of having a truck out of service by avoiding collisions – which can mean game-changing productivity to you.

Active Brake Assist 5

Active Brake Assist 5 detects distance and speed to moving and stationary objects in its path and determines if warning or braking is necessary. It’s the only system on the market that works down to 5 MPH*, making it ideal for travel in congested urban areas. It also recognizes pedestrians who are about to cross in the truck’s path, alerting the operator while partially braking, followed by full braking if the operator does not react.

* with DT12 Transmission

Side Guard Assist

A game changer for safety in and around busy jobsites, Side Guard Assist detects objects on the passenger side of the truck and alerts the operator.

Adaptive Cruise Control To 0 MPH And Tailgate Warning

Detroit Assurance technology enables state-of-the-art features such as Adaptive Cruise Control to 0 MPH* and Tailgate Warning to ease driving in stop and go traffic, as well as help reduce collisions as operators travel from one jobsite to the next.

* with DT12 Transmission

Brake Hold Mode

Available in 2022, Brake Hold Mode enhances driver safety and comfort on the road and at the jobsite. This state-of-the-art feature keeps a truck* stopped when the driver removes their foot from the brake pedal, or if their foot unintentionally slips off.

* with DT12 Transmission

A windshield that makes it easy to see everything, including an advantage in safety

  1. FIELD OF VISION – Delivers best-in-class field of vision thanks to a surface area that’s 28% larger than our previous product offering, making it one of the largest windshields in its class.
  2. ONE-PIECE DESIGN – Roped-in design for easy removal and replacement in case of damage.
  3. SOLAR FILM – Optional solar film reduces heat in the cab, improving operator comfort.
  4. WIDER WIPER ZONE – 24-inch wiper blades that cross over the center of the glass for a 37% improved wiper zone, giving operators a wider range of visibility and better unobstructed view.

Dual Stage Intelligent LED Headlights

  1. Impact Resistance – High-impact polycarbonate lenses with additional hard coating protection to prevent cracking, scratching or damage to the headlight from road or jobsite debris.
  2. Heated Lens – Dual Stage intelligent heat grids to melt away ice and in humid environments, eliminate condensation, in minutes.
  3. Integrated Amber DRL – Integrated amber daytime running lights that double as turn signals, making the truck more visible to oncoming traffic and on the jobsite.
  4. Wide Illumination – LED output is designed to fully illuminate the road and jobsite, including off to the sides of the vehicle, to reduce eye fatigue while letting operators detect objects sooner.


Not all seat combinations are shown.

Base Seat in Charcoal Black
Base Seat in Quarry Grey colour
X-Series Premium seat in Charcoal Black Diamond style
X-Series Premium seat in Quarry Grey Diamond style
X-Series Premium seat in Timber Brown Diamond style
X-Series Premium seat in Charcoal Black Mordura style
X-Series Premium seat in Quarry Grey Mordura style
X-Series Premium seat in Timber Brown Mordura style

The 49X Dash

The dash of 49X is a study in forward-thinking engineering and design, with every decision made to let operators keep their hands on the wheel and eyes on the road.


The 49X has all the options you need to build the truck you want.

1. X-Series steel-reinforced aluminum cab with X-Series steel door

2. Trench-style low roof with lowered center section for optimal packaging of over cab equipment

3. One-piece roped-in windshield

4. Optional impact-resistant and heated windshields available

5. Optional single or high-visibility three-piece rear window

  • X-Series Base
    • Mordura cloth seat
    • Vinyl sleeper upholstery
    • Standard insulation
    • Standard LED cab lighting
    • Black finish steering wheel switches
    • Black finish dash gauge bezels
    • Carbon with black trim accents


    X-Series Premium

    • Laredo leather seats
    • Upgraded sleeper upholstery
    • Premium insulation
    • Premium LED cab lighting
    • Bright finish steering wheel switches
    • Bright finish dash gauge bezels
    • Premium teak trim

1. Quarry Grey

2. Charcoal Black

3. Timber Brown (available on Premium Package only)

1. Impact-resistant, durable, lightweight molded resin hood with sloped high-visibility design

2. ISO TECH Hood Suspension System

3. Standard with locking hood strut

4. Optional Power Hood for high horsepower needs in set-forward axle configurations

Radiator-mounted steel grille with stainless steel surround

1. Best-in-class HVAC with 5 face outlets, 4 floor outlets, 2 side window defrost outlets and 10 blower speeds

2. Available only on sleepers, optional Idle-Free Dual HVAC that provides up to 10 hours of cooling or 34 hours of heating when parked

Engine mounted air intake, plus optional hood-mounted pre-cleaner deliver improved dust capacity

1. Detroit® DD15®, 400-505 HP, 1550-1850 lb-ft

2. Detroit® DD16®, 500-600 HP, 1850-2050 lb-ft

3. Cummins X12, 350-500 HP, 1450-1700 lb-ft

4. Cummins X15, 400-605 HP, 1450-2050 lb-ft

1. Detroit® DT12®-V and Detroit® DT12®-VX

2. Allison Automatic 4000, 4500, 4700

3. Eaton Fuller Manual 10- 13- 18-speed; 8LL and 9ALL

4. Eaton Ultrashift PLUS and Endurant AMT

1. Intuitive and simple to use PTO control system that makes programming easy

2. FEPTO and REPTO available

3. Factory installed transmission PTO

1. Detroit® single 12,000-23,000 lbs

2. Detroit® tandem 36,000 and 40,000 lbs

3. Meritor single 12,000-22,000 lbs

1. Detroit® single 23,000 lbs

2. Detroit® tandem 40,000-44,000 lbs

3. Dana tandem 52,000-70,000 lbs

4. Meritor single 21,000-30,000 lbs

5. Meritor tandem 40,000-84,000 lbs

6. Meritor tridem 69,000-126,000 lbs

1. Flatleaf 14,600-23,000 lbs

2. Taperleaf 12,000-20,000 lbs

1. AirLiner® single 21,000-23,000 lbs

2. AirLiner® tandem 40,000-46,000 lbs

3. AirLiner® tridem 69,000 lbs

4. Chalmers tandem 40,000-70,000 lbs

5. Flatleaf single 23,000-30,000 lbs

6. Hendrickson tandem 40,000-52,000 lbs

7. Neway single 26,000 lbs

8. Neway tandem 46,000-52,000 lbs

9. Neway tridem 69,000-78,000 lbs

10. TufTrac tandem 40,000-52,000 lbs

1. WABCO® 4S/4M and 6S/6M Anti-lock Braking System (ABS) with and without traction enhancement

2. Air Disc Brakes

1. Detroit Assurance® suite of safety systems including: Active Brake Assist 5, Adaptive Cruise Control to 0 MPH, Side Guard Assist, Tailgate Warning, Lane Departure Warning, Automatic Headlights/Wipers and Intelligent High Beams, Brake Hold Mode, Traffic Sign Display and Active Speed Intervention, available with Detroit® engines

2. WABCO® OnGuard including collision mitigation and adaptive cruise control, optional with Cummins engines

1. Single-channel RBM @ 1.8-3.8MM inch-lbs

2. Inner C-channel reinforced RBM @ 4.4-5.5MM inch-lbs

3. 8″-30″ parent rail front frame extensions options available

49X offers three bumper styles in various finishes and thicknesses, as well as a boxed-in bumper with an optional grille guard for logging applications. All 49X bumpers are tapered at the wheel ends for ground clearance and weight savings
  • Standard 1/8″ stainless steel vocational
  • Optional 3/16″ painted steel
  • Optional 1/4″ plain or polished aluminum
  • Optional 5/16″ bright steel severe service
  • Optional 3/8″ painted steel severe service
  • Optional 1/4″ painted or bright steel logger
There are a number of towing device options mounted directly to the front frame head for increased strength and durability, with ratings from 80,000-140,000 lbs
  • Dual Removable Tow Hoops, 80,000 lbs
  • Center Tow Pin, 80,000 lbs
  • High Capacity Center Tow Pin, 140,000 lbs

1. Aluminum 25″ cylindrical, plain or polished

2. LH 60-150 gallon (227-568 liter)

3. RH 60-, 70-, 80-, 100-, 120-, 150-gallon (227-, 265-, 303-, 379-, 454-, 569-liter)

4. Standard forward mounting; optional aft mounting

5. LH and RH split fuel/hydraulic tank options available

6. LH and/or RH auxiliary fuel supply and return ports available

1. 8-, 13- and 23-gallon (23-, 49- and 87-liter)

2. Standard forward mounting

3. Optional LH or RH aft mounting

All-new QuickFit Interface System

1. Easier to integrate truck equipment with the vehicle’s electrical power and communication sources

2. Advanced multiplexed electrical system for easy Truck Equipment Manufacturer (TEM) interface, programming and power access

3. Auxiliary in-cab backwall mounted E-Vault available, which houses:

  • QuickFit Programmable Modules
  • QuickFit Programmable Interface Connector
  • TEM-specific power distribution module
  • High-current power access


Access the latest 49X product information.

X-Series Brochure
X-Series Brochure (French)
49X Tech Sheet
49X Tech Sheet

Let's build your truck!

Our team would be happy to help you build out your perfect truck.