I&T Shop Manuals have been the trusted source for tractor shop manuals since 1948. Written for professionals and experienced mechanics. Easy-to-use format for quick and handy reference. Includes, illustrations, exploded view and photos. Manual covers removal, overhaul, installation and adjustment procedures of various assemblies and sub-assemblies Models 99 (6cy), Super 99, Non-Super 66, Super GM, Super & Non-Super 66, 77, 88, & 660, 770, 880, Super 55, 550, 99, GMTC-950-990-995.