This service repair manual covers the Allison 4000 TRV, an automatic transmission featuring 4th Generation Controls. Designed for robust performance and reliability, this transmission is engineered to meet the demanding requirements of various applications. Its advanced control system ensures optimal operation and efficiency. The manual provides comprehensive information for understanding and maintaining this sophisticated piece of equipment. This English-language manual is designed to assist owners, technicians, and mechanics in the proper maintenance and repair of the Allison 4000 TRV. It includes detailed procedures for disassembly, part inspection, rebuilding, and reassembly, supported by line drawings, cross-sectional views, and exploded views. The manual also covers principles of operation and customer service aspects, ensuring that all users have the necessary resources to keep the transmission functioning at its best.