2 0 Mack 1078 Transmission for a 1978 Mack RD685S Contact for price (Used) 1977 Mack (MT), TRANSMISSION ASSEMBLY- Model: 1078, Serial Number: 9P9498, Part Number: 11KBA5934, Engine: 1977 Mack ENDT676, For more information about this item, give us a call. We... ConditionUsedEngine ModelMack ENDT676Fits To Make(s)MackFits To Model(s)RD685SWill Fit Year(s)1978Part Number11KBA5934Stock NumberP-84833 MLS Number13012571CategoryTransmissions Last Updated11/7/2025 LocationElkton, MD, US Sold ByCRG Heavy Truck Parts (844) 402-___ SHOWNUMBERCall Seller Email Seller Save More Info