 INDIANAPOLIS--BUSINESS WIRE--Allison Transmission Holdings Inc. NYSE: ALSN, a leading designer and manufacturer of conventional and electrified vehicle propulsion solutions and the largest global manufacturer of medium- and heavy-duty fully automatic transmissions for commercial and defense vehicles, today announced that it will hold its first quarter 2022 financial results conference call at 5:00 p.m. ET on Wednesday, April 27. Chairman and Chief Executive Officer David S. Graziosi and Sen 