INDIANAPOLIS–(BUSINESS WIRE)–Allison Transmission Holdings Inc. (NYSE: ALSN), a leading designer and manufacturer of vehicle propulsion solutions for commercial and defense vehicles, the largest global manufacturer of medium- and heavy-duty fully automatic transmissions, and a leader in electrified propulsion systems, today announced that it will hold its third quarter 2021 financial results conference call at 8:00 a.m. ET on Thursday, October 28. Chairman and Chief Executive Officer David S.