8 INTRODUCTION Transmission Identification The Allison RDS and HS transmission identification plate is located on the rear right side of the main case, near the lower end. C0029555 The MACK carrier assembly serial number is located on the front right side of the housing. C0028950 The Eaton® Spicer® rear axle serial number is located on the rear of the axle housing toward the carrier. C0028951