 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 has rescheduled its third quarter 2021 financial results conference call to 5:00 p.m. ET on Wednesday, October 27, from 8:00 am ET on Thursday, October 2 