This 1977-1978 GMC Motorhome Shop Manual Supplement to 1975 - 1976 GMC Motorhome Shop Manual is a high-quality, licensed PRINT reproduction of the service manual authored by GM Corporation and published by Detroit Iron. This OEM factory manual is 8.5 x 11 inches, paperback bound, shrink-wrapped and contains 462 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 1977-1978 GMC Motorhome and Transmode models are covered: ZEO 6081, ZEO 6581, ZEO 6582, ZEO 6083, ZEO 6583, ZEO 6584. 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.