This 1975 GMC Truck 1500-3500 Service Manual Supplement to 1974 GMC Truck Service Manual is a high-quality, licensed PRINT reproduction of the service manual authored by General Motors Corporation and published by Detroit Iron. This OEM factory manual is 8.5 x 11 inches, paperback bound, shrink-wrapped and contains 312 pages of comprehensive mechanical instructions with detailed diagrams, photos and specifications for the mechanical components of your vehicle such as the engine, transmission, suspension, brakes, fuel, exhaust, steering, electrical and drive line. Service / repair manuals were originally written by the automotive manufacturer to be used by their dealership mechanics. The following 1975 GMC models are covered: C15, C15 Suburban, C25, C25 Suburban, C35, Jimmy, K15, K15 Suburban, K25, K25 Suburban, P15, P25, P35, G15, G25, G35. NOTE: This is a SUPPLEMENT. It covers only the servicing of NEW components that differ from what is described in the manual it supplements. It is designed to be used with the parent manual referenced in the title. You will need BOTH manuals for complete service information. This factory written Detroit Iron shop manual is perfect for the restorer or anyone working on one of these vehicles.