GMC - S SERIES - 1979 RSS 1979 GMC S SERIES ELECTRICAL SYSTEM:ALTERNATOR/GENERATOR/REGULATOR 1979 GMC S SERIES SUSPENSION:MULTIPLE AXLE 1979 GMC S SERIES VEHICLE SPEED CONTROL 1979 GMC S SERIES STEERING:LINKAGES:TIE ROD ASSEMBLY 1979 GMC S SERIES STEERING:LINKAGES 1979 GMC S SERIES SERVICE BRAKES, AIR:DRUM