1971 GMC Truck Conventional Models Series 4500-6500 Sales Brochure. The hauler you would design for yourself. Sturdy cab construction stands up to years of strenuous service. Interior good looks look good to busy drivers. GMC single-axle chassis stands the test of time. The chart on chassis page with dimensions. GMC tandem-axle chassis puts on pounds profitably. The chart on tandem-axle page with dimensions. Profits eluding you? Keep running costs on the run with reliable GMC engines. The chart shows gas and diesel engines available. Specifications on back. ADV 71-8-(8-70)