INDIANAPOLIS, April 13, 2012 /PRNewswire/ -- Allison Transmission Holdings, Inc. (NYSE: ALSN), the premier global provider of commercial duty fully-automatic transmissions and hybrid-propulsion systems, will hold its first quarter 2012 results conference call at 4:30 p.m. Eastern Time on Monday, April 23. Lawrence E. Dewey, Chairman and Chief Executive Officer, and David S. Graziosi, Chief Financial Officer, will review the company's financial performance for the period. The dial-in for the conference call is 1-877-941-1427 and the international dial-in number is 1-480-629-9664. A live webcast of the conference call will also be available on the investor relations page of the Company's website at http://ir.allisontransmission.com/. The press release announcing Allison Transmission's first quarter 2012 Results will also be available on the website under "Financial News Releases". For those unable to participate in the conference call, a replay will be available from 7:30 p.m. Eastern Time on April 23, 2012 until Noon Eastern Time on May 1, 2012. The replay dial-in number is 1-877-870-5176 and the international replay dial-in number is 1-858-384-5517. Replay passcode is 4532173. About Allison Transmission Allison Transmission is the world's largest manufacturer of fully-automatic transmissions for medium- and heavy-duty commercial vehicles, medium- and heavy-tactical U.S. military vehicles and hybrid-propulsion systems for transit buses. Allison transmissions are used in a variety of applications including on-highway trucks (distribution, refuse, construction, fire and emergency), buses (primarily school and transit), motor homes, off-highway vehicles and equipment (primarily energy and mining) and military vehicles (wheeled and tracked). Founded in 1915, the Allison business is headquartered in Indianapolis, Indiana, U.S.A. and employs approximately 2,800 people. Allison has manufacturing facilities and customization centers located in China, The Netherlands, Brazil, India and Hungary, with a global presence, serving customers in North America, Europe, Asia, Australia, South America and Africa. Allison also has more than 1,500 independent distributor and dealer locations worldwide. More information about Allison is available at www.allisontransmission.com.