6 0 1978 Mack RD685S Front Axle Assembly Contact for price (Used) 1978 Mack RD685S, COMPLETE FRONT AXLE, Part Number: 3QH415CF, Serial Number: A4308, Make: Mack, Model: 3QHF414EP, Capacity: 12,000Lbs, Hub Bolts: 6, Brake Type: Drum, Center Leaf to... ConditionUsedFits To Make(s)MackFits To Model(s)RD685SWill Fit Year(s)1978Capacity12,000Part Number3QH415CStock NumberP-84840 MLS Number13012579CategoryAxle Assemblies, Front Last Updated9/30/2025 LocationElkton, MD, US Sold ByCRG Heavy Truck Parts (844) 402-___ SHOWNUMBERCall Seller Email Seller Save More Info