Allison Transmission 29504583 PROM & RET Ignition Modulator ECU is an ignition control module used in Allison transmission systems. The part number 29504583 identifies a PROM-based ignition modulator with RET functionality, forming part of the ignition timing modulation hardware within the transmission’s electronic control network. This ECU handles ignition modulation signals as part of the drivetrain control architecture and is intended for use in service and repair of compatible Allison gearboxes.
