General Motors was founded in Flint, Michigan, in 1908 by William C. Durant and grew into one of the largest vehicle manufacturers in the world. Over the decades its brand portfolio has included Chevrolet, GMC, Cadillac, Buick, Vauxhall and Opel, giving GM an unmatched spread of light commercial products. Chevrolet and GMC vans in particular have served every trade from plumbing to parcel delivery, and GMC has marketed commercial vehicles since the early twentieth century.

GM's van output ranges from the classic G-series vans, sold as the Chevrolet Van and GMC Vandura, to the Express and Savana full-size vans that have served fleets since 1996. Cutaway van and P-chassis platforms underpin countless delivery trucks, ambulances, shuttle buses and motorhomes built by body makers. Upfitter guides and body-builder data made these chassis the backbone of the specialty-vehicle industry.

The General Motors manuals here typically cover small-block and Vortec V8 engines, transmissions, rear axles and differentials, brakes, steering, suspension, HVAC and complete electrical systems, including wiring diagrams, torque specifications, diagnostic codes and maintenance schedules. Transfer-case and differential sections appear on four-wheel-drive versions.

DIY owners, fleet maintenance shops and motorhome converters all rely on this level of factory documentation. The downloadable PDF format means the information is available instantly on any device in the workshop or on the road. Keeping PDFs on a tablet saves time during busy service days.