Philadelphia Gear Corporation. Philadelphia Gear® is one of the oldest and most respected gear manufacturers in the United States. The company supplies precision gear products and services for the power, marine, cement and steel industries, among others. With a world-class engineering department, the company is a major designer and supplier of gear drives to U.S. military shipbuilders. The company also operates a network of regional service facilities for aftermarket support of its large installed base of gear drives. In its 75+ year history, Philadelphia Gear has produced products on over 400,000 individual bills of materials for tens of thousands of customers. The company's manufacturing and service center facilities are located in Los Angeles, CA, Houston, TX, Mokena, IL, New Castle, DE and Birmingham, AL. The company's corporate headquarters are located at 901 E. Eighth Avenue, Suite 100, King of Prussia, PA 19406.