The 2013-2018 Ram 6.7L primary radiator leaks at the tank or lets the transmission run hot when the in-tank cooler is restricted. Replace it with the CSF 3663. The core uses a stronger B-tube layout and keeps a plate-style transmission cooler in the tank.

• Build: Two rows, 21-11/16 inches by 26-5/8 inches and 1-5/8 inches thick, crossflow, so coolant and the transmission cooler both see airflow.
• Transmission cooler: A 12-inch high-efficiency plate cooler is built into the radiator, with quick-connect oil-cooler fittings.
• Tank: Glass-filled plastic tank and EPDM seals, leak-tested at 150 percent of operating pressure.
• Hoses: Coolant inlet and outlet are 1-13/16 inch, inlet on the left and outlet on the right.
• Part number: CSF 3663 crosses OEM 52014720AA and 52014738AA.
• Fitment: 2013-2018 Ram 2500, 3500, 4500, and 5500 with the 6.7L Cummins. This is the large primary radiator.
• Does not fit: The small 1-row radiator, CSF 3664. Do not use 3663 if the failed part is the smaller secondary core.
• Not in the box: The radiator cap is not included, and the hoses and clamps are not in the box.
• Warranty: CSF lists a 2-year limited warranty for the original owner. The term is on the warranty card in the box.

Order today to secure your replacement. Confirm you are replacing the large primary radiator, not the smaller 1-row unit, before you order.