Navistar International Corp. is a holding company whose individual units provide integrated and best-in-class transportation solutions. Based in Warrenville, Ill., the company produces International® brand commercial truc......Navistar International Corp. is a holding company whose individual units provide integrated and best-in-class transportation solutions. Based in Warrenville, Ill., the company produces International® brand commercial trucks, mid-range diesel engines and IC brand school buses, and Workhorse brand chassis for motor homes and step vans. It is a private-label designer and manufacturer of diesel engines for the pickup truck, van and SUV markets. The company also provides truck and diesel engine parts and service. A wholly owned subsidiary offers financing services.