Engineered for upfit.

The 49X was built with Truck Equipment Manufacturers (TEMs) in mind. We designed the truck to ease body upfit for every type of truck including dump trucks, cement mixers, cranes, and engineered it with features to make it fast and simple to access wiring and add controls.


Technical Resource Guide

All 49X technical details can be found in the Technical Resource Guide (TRG). For access to the TRG, log onto

QuickFit Interface System

The all-new QuickFit Interface System makes it easier than ever to integrate truck equipment to the vehicle's electrical power sources. It features an advanced multiplexed electrical system designed for easy TEM interface, programming and access to power. Other features include:

  • Electronic control units stored in the cab E-Vault for easy access
  • Key components protected from the elements and accessed without having to use hand tools
  • Additional exterior lighting interface for snow plow, beacon and utility lights
  • All-new PTO control architecture designed to simplify complex PTO control logic programming
QuickFit Interface System

An auxiliary in-cab backwall mounted E-Vault is also available and includes:

  • QuickFit Connectors
    • Customer Interface Connectors
    • Powertrain Interface Connector
    • Body Lighting Interface Connectors (also available back-of-cab or end-of-frame)
  • TEM-specific power distribution module
  • High-current power access

Western Star's proprietary CHEC Tool is the interface to the 49X's programmable controllers,
enabling TEMs and dealers to view and modify electrical configurations on the 49X.



  • The CHEC Tool reduces upfit time and makes the customization process user friendly. CHEC gives you the power to customize inputs and outputs and change parameters within minutes — entirely within your organization
  • Standard templates can be created for your organization, enabling you to select pre-existing configurations based on different applications or customers
  • The CHEC Tool increases customization possibilities, such as creating custom dash layouts for your customers. This tool is a powerful way for you to better serve your customers' unique needs
Mid-Chassis Packaging

The 49X chassis was designed to make it easier than ever to mount bodies for any application. The mid-chassis packaging offered on the 49X includes features that deliver clear back-of-cab to ensure more efficient body integration. Key mid-chassis packaging features include:


DEF Tanks 8-, 13-, and 23-gallon capacities — all mounted in the most forward position for consistent fill and fender gaps.
DEF Tanks
Battery Boxes Standard battery box mounting inside the cab and under the passenger seat to optimize open frame space. Battery boxes can also be mounted between rails or frame-mounted.
Battery Boxes
Air Tanks Can be mounted below battery box, inside or below frame rail, or perpendicular to the frame. Aluminum air tanks are available for additional weight savings.
Air Tanks
Fuel Tanks 25-inch diameter with capacities from 60 to 150 gallons, and can be mounted either side fore or aft.Combo TanksFuel/Hydraulic Combo tanks are offered if frame space is critical.
Fuel Tanks
Air Dryer Consistent mounting locations to ease upfit.
Air Dryer