INTRODUCTION 7 On Cummins® ISL engines, the engine dataplate is located on the engine rocker level cover, but also may be located on the gear housing. W8061484 On Cummins® ISX engines, the engine dataplate is located on the engine rocker level cover, but also may be located on the gear housing. W8061485 Transmission Identification The MACK T300 Series transmission serial number is located on the rear left side of the main case. C0032623