This service repair manual covers the Allison Transmission 4000 Series Generation Controls Vocational Models. Designed for vocational applications, these transmissions are engineered for robust performance and reliability in demanding environments. The manual provides comprehensive information for owners and technicians alike, detailing the intricacies of these advanced transmission systems. The scope of this manual encompasses essential maintenance procedures, general overhaul instructions, and detailed disassembly and assembly processes for various transmission models including the 4000 EVS, 4000 HS, 4000 MH, and others. It offers step-by-step instructions for self-repair, wear limits, spring data, and customer service information, ensuring that the Allison Transmission 4000 Series Vocational Models can be maintained and repaired effectively.