Allison Transmission Holdings, Inc. engages in the design and manufacture of vehicle propulsion solutions for commercial and defense vehicles. The company also manufactures medium and heavy duty fully automatic transmissions and electrified propulsion systems. Its products are used in a variety of applications, including on-highway trucks, buses, motorhomes, off-highway vehicles and equipment, and defense vehicles. The firm also sells branded replacement parts, support equipment, aluminum die cast components, and other products necessary to service the installed base of vehicles utilizing its solutions. The company was founded in 1915 and is headquartered in Indianapolis, IN.