General Motors was founded in 1908 in Detroit, Michigan, by William C. Durant, bringing together Chevrolet, Buick, GMC, and Cadillac under one company, along with Pontiac, Oldsmobile, and Saturn at various points in its history. Over more than a century, GM grew into one of the largest automakers in the United States, producing everything from family sedans and pickup trucks to heavy-duty work vehicles.

GM is widely known for its long-running engine families, including the small-block V8 introduced in 1955 and its modern successors, the LS and LT V8 series. The company also builds Ecotec four-cylinder engines and the 6.6L Duramax V8 diesel, developed jointly with Isuzu, along with the Vortec line of truck engines. GM was also an early leader in automatic transmission technology, introducing the Hydra-Matic in 1940 as one of the first mass-produced automatic transmissions.

The manuals available on this page cover Vortec, LS-family, Duramax, and other GM gasoline and diesel engines used in cars, trucks, and industrial applications. They typically include detailed engine rebuild procedures, transmission service information, electrical system and wiring diagrams, torque specifications, diagnostic steps, and scheduled maintenance intervals.

Because these manuals are written to match factory service standards, they give a reliable reference point for anyone working on GM powertrains. This information benefits DIY owners performing their own repairs, independent garages servicing GM vehicles, restorers working on older models, and professional workshops that need accurate factory-level reference material for GM engines and drivetrains.