2 0 Mack C92 Rear Axle Housing for a 1978 Mack RD685S Contact for price (Used) 1978 Mack RD685S, FRONT DIFFERENTIAL HOUSING ONLY- Make: Mack, Model: C92, Ratio: 4.17, Capacity: 21,000Lbs, For more information about this item, give us a call. We ship... ConditionUsedFits To Make(s)MackFits To Model(s)RD685SWill Fit Year(s)1978Stock NumberK37343 MLS Number13012598CategoryAxle Housings, Rear Last Updated7/27/2024 LocationElkton, MD, US Sold ByCRG Heavy Truck Parts (844) 402-___ SHOWNUMBERCall Seller Email Seller Save More Info