This CD rom includes complete reproductions of 5 original printed paper manuals that GMC mechanics used to service medium and heavy duty trucks. It includes the: 837 page 1973 X-7333 1973 GMC Truck Service Manual Medium Duty Trucks Series 5000 Thru 6500, the 975 page 1973 X-7334 1973 GMC Truck Service Manual Heavy Duty Trucks Series 7500 Thru 9500, the 216 page 1974 X-7433 1974 GMC Truck Service Manual Supplement Medium Duty Trucks Series 4500-6500, the 87 page 1974 X-7434 1974 GMC Truck Service Manual Supplement Heavy Duty Trucks Series 7500-9500, and the 400 page 1975-1976 X-7533 1975 and 1976 GMC Truck Service Manual Supplement Medium and Heavy Duty Trucks Series 4500-9500. 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, and specifications on this CD, You can use the information on this CD to restore 1973-1976 GMC trucks, including CE, CS, CG, CM, SE, SG, SM, SS, TE, TG, TM, ME, PS, PD, MM, 4000, 4500, 5000, 5500, 6000, 6500, P, T, C, H, J, M, D, F, W, R, S, Series 7000, 7500, 8000, 8500, 8721, 9000, 9003, 9500, 9502, BBC, and Astro 95. Covers both Gasoline and Diesel. It includes conventional cabs, short conventionals, tilts, and rear engine forward control.