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Navistar Expands International Prostar Transmission Offerings With Lightweight Option

ProStar with 13-liter engine and Tremec transmission delivers performance for weight-sensitive applications


Navistar, Inc. today announced it will offer the Tremec 10-speed manual transmission in its International® ProStar® model with the company’s 13-liter engine. Tremec offers a wide range of high torque-to-weight ratios designed for weight sensitive over-the-road and city applications. The pairing will also maximize payload for applications such as bulk haul.

“Tremec transmissions are not only known in the automotive industry for a wide variety of high-performance cars, but Tremec components are used in transmissions throughout the commercial transportation industry,” said Jodi Presswood, general manager, Heavy-Duty Truck Product Line, Navistar. “This lightweight transmission reduces the weight of the vehicle while also providing our customers with yet another choice.”

Navistar will offer four Tremec transmission options paired with the company’s 13-liter engine, available with 370-450 horsepower and 1,350-1,700 lb.-ft. torque for line haul and regional haul applications in the United States and Canada.

The company also offers Tremec transmissions as an option in its ProStar with Cummins ISX15.

  Key features and benefits include:

  • Patented Optilube™ system provides an internal lube pump and pressurized distribution system to ensure adequate lubrication at all times
  • Exceptionally smooth shifting
  • Driver friendly shift pattern
  • High torque-to-weight ratio
  • Wide choice of Power Take-Off applications
  • Deep first and reverse gears for excellent maneuverability

About Navistar

Navistar International Corporation (NYSE: NAV) is a holding company whose subsidiaries and affiliates produce International® brand commercial and military trucks, MaxxForce® brand diesel engines, and IC Bus™ brand school and commercial buses. An affiliate also provides truck and diesel engine service parts. Another affiliate offers financing services. The International® ProStar® with Cummins ISX15 and International® TerraStar® 4x4 were named 2014 heavy-duty and medium-duty commercial truck of the year, respectively, by the American Truck Dealers (ATD) association. Additional information is available at


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