Western Star Trucks launched its EPA 2007 chassis and latest product enhancements at the Mid-America show. In order to accommodate the larger radiators required to cool ’07 engines, engineers added a drop-front frame
casting on all models so that they wouldn’t have to make exterior modifications to the traditional Western Star hood and grille. Raised radiator configurations with integral front frame extensions and a front engine power takeoff are also available for vocational applications.

A 56-in. asymmetric spring provides improved roll stiffness and better handling in turns while maintaining soft ride characteristics, and new steering gear and optimized geometry improve road feel, overall wheel cut, and turning radius. Western Star will also add an 18,000-lb steer axle to the option list.

Aftertreatment systems for 2007 offer both horizontal and vertical mounting with vertical tailpipes.

The lightweight 4900 SA with 123-in. BBC is now available with a butterfly hood, and the 4900 FA with set-forward axle has also been updated with an optional single-piece hood.