This comprehensive repair manual provides detailed instructions for removing the in-chassis synchronizer on a variety of MACK truck transmissions. The manual covers models from the year 2003 and includes step-by-step instructions for each transmission type. The manual begins with an introduction, safety information, and conversion chart, followed by a clear explanation of the numerical code used throughout the manual. The repair instructions are organized by transmission type, with each chapter providing a detailed explanation of the process. The manual includes detailed illustrations and diagrams to guide the user through each step, ensuring a successful repair. This manual also includes a section dedicated to special tools and equipment that may be required during the removal process. Whether you're a professional mechanic or a DIY enthusiast, this manual is an essential resource for anyone needing to remove the in-chassis synchronizer on a MACK truck transmission.