This CD rom includes complete reproductions of 4 original printed paper manuals that GMC mechanics used to service trucks. It includes the: 1087 page 1977 X-7733 GMC 1977 Truck Service Manual All Models 4500 thru 6500, the 1144 page 1977 X-7734 GMC 1977 Truck Service Manual All Models 7500 thru 9500 (Except General ), the 365 page 1978 X-7833 GMC 1978 Truck Service Manual Supplement All Models 4500 thru 9502, and the 486 page 1979 X-7933 1979 GMC Medium and Heavy Duty Truck Service Manual Supplement. Get the know-how on front-end alignment, fender, hood and grille replacement, brake system maintenance, clutch removal installation, ignition timing, engine tune-up, carburetor overhaul, power steering repair, transmission inspection, and much, much more! 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, specifications, and wiring diagrams on this CD. Valuable resource to restore all 1977-1979 GMC trucks, including C, CS, CE, CD, SE, TE, ME, 4000, 4500, 5000, 6000, 6500, 7000, 7500, 8000, 9000, 9500, 9502, 9003, H, J, F, D, W, N, BBC, P4 Forward Control, B6 Bus, Brigadier, Astro 95, including both 4x2, 6x4, conventionals, BBC, Tilt Cab, forward control chassis (for stepvans and other vehicles), and bus chassis. Covers both Gasoline and Diesel, though the diesel engine itself may require a separate engine manual.