 INDIANAPOLIS--BUSINESS WIRE--Allison Transmission Holdings Inc. NYSE: ALSN, Allison Transmission, 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 host a virtual Technology Day on Wednesday, October 6, 2021 at 10:00 AM ET. Allison Transmissions leadership team will discuss the companys 