sentences:  During 1977 and 1978, GMC Truck and Coach further split its heavy-duty truck range.The Chevrolet M90/GMC M9500 were replaced by the Chevrolet Bison and GMC General in 1977, with the H/J range renamed the Chevrolet Bruin/GMC Brigadier in 1978.Similar in layout to the Ford LTL-9000, International Harvester Transtar 4300, and Mack Super-Liner, the Chevrolet Bison and GMC General are Class 8 conventional trucks.