This CD rom includes complete reproductions of 4 original printed paper manuals that GMC mechanics used to service trucks. It includes the: 922 page 1978 X-7832 GMC 1978 Truck Service Manual Light Duty Trucks Series 1500 thru 3500 (Including Jimmy, G and P Models), the 419 page 1978 X-7832 1978 GMC Truck Overhaul Manual Light Duty Trucks Series 1500 Thru 3500 (Including Jimmy, G and P Models), the 1025 page 1979 X-7932 GMC 1979 Service Manual Light Duty Trucks, and the 384 page 1979 X-7932 GMC 1979 Overhaul Manual Light Duty Trucks. In the service manuals The CD includes detailed service procedures for lubrication, frame, shock absorbers, front suspension, rear axle and suspension, brakes, engine, transmission, fuel, exhaust, wheels, tires, chassis-sheet metal, electrical system, heater and air-conditioning. In the overhaul manuals The CD includes step-by-step instructions for tearing down and rebuilding air-conditioner compressor, front axle differential, rear axle differential carrier, engine, carburetors, clutch, transmission, and steering.With clear pictures, exploded view illustrations, schematics, specifications, and a list of special tools, you will have everything you need to get the job d1 right. With the step-by-step illustrated instructions and specifications on this CD. Valuable resource to restore all 1978-1979 GMC trucks, including half ton, 3-quarter ton, 1 ton, 1500, 2500, 3500, C, K, G, P, Fenderside, Wideside, pickup, Sierra, Sierra Grande, High Sierra, Sierra Classic, Street Coupe, crew cab, bonus cab, Suburban, full-size Jimmy, stakebed, crew cab, van, Rally Van, STX, Gaucho, Gypsy, Vandura, van chassis, hi-cube van, Value Van, forward control chassis, and stepvan. Includes 2 wheel drive, 4 wheel drive, and dually models. Covers both gasoline and diesel engines. Includes van-based well as forward control motorhomes chassis, classes A and C. This book covers the part of the motorhome manufactured by GMC and will not cover motorhome bodies.