MACK - U - 1978 RSS 1978 MACK U ENGINE AND ENGINE COOLING:ENGINE 1978 MACK U STEERING:WHEEL AND HANDLE BAR 1978 MACK U SUSPENSION:MULTIPLE AXLE 1978 MACK U SERVICE BRAKES, AIR:ANTILOCK:INTERCONNECTING ASSEMBLY(WIRING) 1978 MACK U SUSPENSION:MULTIPLE AXLE