NAVISTAR - S SERIES - 1980 RSS 1980 NAVISTAR S SERIES ELECTRICAL SYSTEM:ALTERNATOR/GENERATOR/REGULATOR 1980 NAVISTAR S SERIES SUSPENSION:MULTIPLE AXLE 1980 NAVISTAR S SERIES VEHICLE SPEED CONTROL 1980 NAVISTAR S SERIES STEERING:LINKAGES:TIE ROD ASSEMBLY