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This is a vintage 1957 Hydra-Matic Controlled Coupling Transmission Diagnosis Guide, published by the Detroit Transmission Division of General Motors Corporation. This manual is an essential resource for understanding the principles, testing, and diagnosis of the 1956 and 1957 Hydra-Matic transmissions, specifically referencing the 1957 model 313 Hydra-Matic. The guide includes detailed sections on introduction, principles of operation, driving instructions, testing, diagnosis, and oil leaks. It features numerous diagrams, shift charts, and illustrative content to aid in repair and maintenance. Despite some wear and tear consistent with its age, including a torn back cover and general handling marks, the interior pages appear largely intact and readable. A valuable piece of automotive history for mechanics, collectors, and enthusiasts of classic GM vehicles.
