1977 GMC Trucks 72 Inch Steel Tilt Sales Folder. GMC proven Steel Tilt Models offer users a brawny short cab design that is easy to maneuver in a tight circle in city traffic...and easy for the driver to enter or exit the cab. The short 72" cab permits longer body and trailers within a given length and improved weight distribution. The set-back axle design permits greater payload on the front axle. Good visibility with a wide wraparound windshield is one of the added advantages of the cab-forward design that includes fingertip controls and easy-to-read gauges. Brawny tight cab design. Rear axles. Delcotron generator. Freedom battery. Balanced power. High energy ignition. Chart of Engine Specifications and technical information on the back. Form ADV 77-12