Allison Transmission is a manufacturer of commercial-duty automatic transmissions and hybrid propulsion systems. The transmissions are part of vehicles used in agriculture, mining, transportation, defense, and construction. The company also offers genuine parts and refurbishment and maintenance services for transmissions. The largest end market is the on-highway segment, including class 4 up to class 8 trucks, school buses, coaches and motorhomes. Allison Transmission generates the majority of its revenue in North America.