1979 MACK R SERIES - EXTERIOR LIGHTING 1979 MACK R SERIES - STEERING:GEAR BOX (OTHER THAN RACK AND PINION) 1979 MACK R SERIES - PARKING BRAKE:DRIVELINE:AIR 1979 MACK R SERIES - SERVICE BRAKES, AIR:CONTROLS:HAND CONTROL 1979 MACK R SERIES - SUSPENSION:REAR:SPRINGS:LEAF SPRING ASSEMBLY