This CD rom includes complete reproductions of 2 original printed paper manuals that GMC mechanics used to service trucks. It includes the: 1, 015 page 1980 GMC Service Manual Light Duty Trucks and the 410 page Unit Repair Manual (Overhaul) 1980 (the CD has the Chevy version of the Unit Repair manual, which has the same content as the GMC version). 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! The overhaul (also called unit repair) manual contains instructions on how to completely disassemble, refurbish, and reassemble comp1nts after they are removed from the vehicle. 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 step-by-step instructions, clear pictures, exploded view illustrations, schematics, and specifications, You can use the information on this CD to restore 1980 GMC trucks, including half ton, 3-quarter ton, 1 ton, 1500, 2500, 3500, C, K, G, P, pickup, Sierra, Sierra Grande, High Sierra, Sierra Classic, crew cab, bonus cab, Suburban, 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.