1966 GMC Trucks Diesel Medium and Heavy-Tonnage Models Sales Brochure. Black Logo. Diesel Powered 4x2 92-inch BBC. Every GMC is designed to increase your profits by cutting your trucking costs. GMC's diesel-powered medium- and heavy-tonnage conventional models are completely new for 1966. Full-depth frames, wide-center front suspensions and new radius rod rear springs are typical of the chassis advancements to be found throughout the line! Two new Toro-Flow V-8's offer greater versatility for units in average heavy-tonnage use. The popular "N" Series diesels and Toro-Flow V-6's provide comparable performance in extra-heavy and medium-tonnage trucks. New transmissions and proven, hydraulically actuated clutches are available to let the engines operate at peak efficiency under changing road and load conditions. Check the big choice of tough truck components shown in this folder. You'll find GMC is well prepared to build a truck to do your job promptly and efficiently. Good condition with minor wear and soiling [see photos]. ADV 555--6-65