1978 Mack RD685S, Truck Trailer, I Beams, Fits to: Mack RD685S, (Used) 1978 Mack RD685S, FRONT AXLE BEAM- Part Number: 3QH415CF, Serial Number: A4308, Make: Mack, Model: 3QHF414EP, Capacity: 12,000Lbs, Center Leaf to Center Leaf: 34", For more information about this item, give us a call. We ship Worldwide! (CRG HEAVY TRUCK PARTS) 929 W PULASKI HWY ELKTON MD, 21921, Truck Year 1978, VIN RD685S3685, Axle Make Mack RD685S3685