Break new ground with the 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.

Built with one goal in mind

We spent half a decade designing and engineering the X-Series line of trucks to be the best vocational trucks on the market. Period. To achieve that, they had to meet seven benchmarks we established at the start of the project. And we put them to the test to make sure they delivered on every one of them.

Take a walkaround without even standing up.

Experience a 360-degree view of the 49X with the options and color of your choice.
It's the closest you can get until you're standing next to a real one.

Colors and materials are for reference only. Actual selection options may vary. See your Western Star dealership for complete details.
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49X Specifications
Interior Day Cab
Interior Sleeper
49X Sleeper Options
Open Specifications


  • X-Series steel-reinforced aluminum cab with X-Series steel door
  • Trench-style low roof with lowered center section for optimal packaging of over cab equipment
  • One-piece roped-in windshield
  • Optional impact-resistant and heated windshields available
  • 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


  • Quarry Grey
  • Charcoal Black
  • Timber Brown
    (available on Premium Package only)


  • Impact-resistant, durable, lightweight molded resin hood with sloped high-visibility design
  • ISO TECH Hood Suspension System
  • Standard with locking hood strut


  • Radiator-mounted steel grille with stainless steel surround


  • Best-in-class HVAC with 5 face outlets, 4 floor outlets, 2 sidewindow defrost outlets and 10 blower speeds
  • 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-cleaners deliver improved dust capacity


  • Detroit® DD15®, 400-505 HP, 1550-1850 lb-ft
  • Detroit® DD16®, 500-600 HP, 1850-2050 lb-ft
  • Cummins X12, 350-500 HP, 1450-1700 lb-ft
  • Cummins X15, 400-605 HP, 1450-2050 lb-ft


  • Detroit® DT12®-V and Detroit® DT12®-VX
  • Allison Automatic 4000, 4500, 4700
  • Eaton Fuller Manual 10- 13- 18-speed; 8LL and 9ALL
  • Eaton Ultrashift PLUS and Endurant AMT


  • Intuitive and simple to use PTO control system that makes programming easy
  • FEPTO and REPTO available
  • Factory installed transmission PTO


  • Detroit® single 12,000-23,000 lbs
  • Meritor single 12,000-22,000 lbs


  • Detroit® single 12,000-23,000 lbs
  • Detroit® tandem 40,000-44,000 lbs
  • Dana tandem 52,000-60,000 lbs
  • Meritor single 21,000-30,000 lbs
  • Meritor tandem 40,000-58,000 lbs
  • Meritor tridem 69,000-78,000 lbs


  • Flatleaf 14,600-23,000 lbs
  • Taperleaf 12,000-20,000 lbs


  • AirLiner® single 21,000-23,000 lbs
  • AirLiner® tandem 40,000-46,000 lbs
  • AirLiner® tridem 69,000 lbs
  • Chalmers tandem 40,000-70,000 lbs
  • Flatleaf single 23,000-30,000 lbs
  • Hendrickson tandem 40,000-52,000 lbs
  • Neway single 26,000 lbs
  • Neway tandem 46,000-52,000 lbs
  • Neway tridem 69,000-78,000 lbs
  • TufTrac tandem 40,000-52,000 lbs


  • WABCO® 4S/4M and 6S/6M Anti-lock Braking System (ABS) with and without traction enhancement
  • Air Disc Brakes


  • 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, available with Detroit® engines
  • WABCO® OnGuard including collision mitigation and adaptive cruise control, optional with Cummins engines


  • Single-channel RBM @ 1.8-3.8MM inch-lbs
  • Inner C-channel reinforced RBM @ 4.4-5.5MM inch-lbs
  • 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


  • Aluminum 25" cylindrical, plain or polished
  • LH 60-150 gallon (227-568 liter)
  • RH 60-, 70-, 80-, 100-, 120-, 150-gallon (227-, 265-, 303-, 379-, 454-, 569-liter)
  • Standard forward mounting; optional aft mounting
  • LH and RH split fuel/hydraulic tank options available
  • LH and/or RH auxiliary fuel supply and return ports available


  • 8-, 13- and 23-gallon (23-, 49- and 87-liter)
  • Standard forward mounting
  • Optional LH or RH aft mounting


  • All-new QuickFit Interface System
    • Easier to integrate truck equipment with the vehicle's electrical power and communication sources
    • Advanced multiplexed electrical system for easy Truck Equipment Manufacturer (TEM) interface, programming and power access
    • Auxiliary in-cab backwall mounted E-Vault available, which houses:
      • QuickFit Programmable Controllers
      • QuickFit Interface Connectors
      • TEM-specific power distribution module
      • High-current power access
Proven like no other

The Western Star X-Series family of trucks have been tested and validated more than any Western Star before. We tested them. Then tested them again and again, in every imaginable condition until we made sure they would pass our tests, and yours.

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