Navistar, Inc. announced it continues to invest in its severe service and medium-duty product lines by expanding vehicle enhancements and powertrain choices on International brand vocational truck models. In addition, the company will add selective catalytic reduction (SCR) emissions technology to its high horsepower mid-range engines starting this summer.

The company’s medium-duty SCR transition began in September 2013 with the International DuraStar and the Cummins ISB 6.7L engine. MaxxForce 9 and MaxxForce 10 engines with SCR will be available exclusively on the International DuraStar and International WorkStar vehicles.

“Our medium-duty transition to SCR started strong with our DuraStar with Cummins ISB6.7 and we have high expectations for this chassis/engine combination as we see the construction market continue to rebound,” said Bill Kozek, president, North America Truck and Parts, Navistar. “We also know a number of our customers require more horsepower and torque and we’re pleased to offer these customers an expanded engine choice by adding SCR to our 9.0L and 10.0L engines." 

The International TerraStar, Work Truck magazine's 2014 Medium-Duty Truck of the Year and 2014 ATD Medium-Duty Truck of the Year, will also be offered with added enhancements. The Allison Optimized 1000 Series transmission with an optional 6th speed is now available exclusively on the TerraStar. With the addition of the 6th speed, the close ratio, fully-automatic transmission offers improved fuel economy, lower engine noise and optimized performance. The TerraStar also features a refined front suspension with a redesigned front spring and bumper. The suspension offers a smoother ride especially when driving over rough terrain.