The International Harvester B-275 Tractor, produced approximately between 1955 and 1961, represents a significant piece of agricultural engineering from a renowned American manufacturer. Known for its reliability and robust design, this utility tractor, powered by an IH 'BD' Series diesel engine, typically offered around 35-40 PTO horsepower and featured a constant mesh sliding gear transmission with 8 forward and 2 reverse speeds. Its practical design, including drum brakes and a focus on operational functionality, made it a popular choice for various farming tasks. The B-275’s enduring reputation is a testament to its solid construction and dependable performance in its era. This service repair manual provides comprehensive technical information specifically for the transmission system of the International Harvester B-275 Tractor. It covers detailed procedures for maintenance, adjustments, and repairs, including information on gearbox components, clutch operation, shifting mechanisms, and lubrication. The manual is designed to assist tractor owners, mechanics, and restoration enthusiasts by offering in-depth guidance, diagnostic support for common faults, and manufacturer specifications. Its searchable and bookmarked format ensures easy access to critical information for maintaining and repairing this classic piece of machinery.