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Thumbnail Filmstrip of 2019-2023 6.7L Cummins CSF 3944 OEM Style Replacement Radiator Images
A leaking or swollen tank on the 2019-2024 Ram 6.7L radiator lets the engine climb past normal temp on the highway. Replace it with the CSF 3944 if your core opening matches the narrower radiator. CSF uses a 2-row, 1-5/8 inch core in place of the factory 1-row 36 mm core.
- Build: Core width is 33-3/8 inches, height is 20-5/16 inches, and thickness is 1-5/8 inches, with two rows, so it rejects more heat than the thinner factory row in the same style of opening.
- No transmission cooler: No transmission oil cooler is built into this radiator.
- Tank: Glass-filled plastic tank and EPDM seals, leak-tested at 150 percent of operating pressure.
- Hoses: Inlet and outlet are 1-15/16 inch, inlet on the left and outlet on the right.
- Part number: CSF 3944 crosses OEM 68322491AA.
- Fitment: 2019-2024 Ram 2500, 3500, 4500, and 5500.
- Does not fit: The wider 39-3/8 inch radiator, CSF 3937. A 2025-2026 Ram 2500 is on 3937, not this part.
- 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. Measure the core. Order this radiator only if the opening matches 33-3/8 inches wide.
A leaking or swollen tank on the 2019-2024 Ram 6.7L radiator lets the engine climb past normal temp on the highway. Replace it with the CSF 3944 if your core opening matches the narrower radiator. CSF uses a 2-row, 1-5/8 inch core in place of the factory 1-row 36 mm core.
Build: Core width is 33-3/8 inches, height is 20-5/16 inches, and thickness is 1-5/8 inches, with two rows, so it rejects more heat than the thinner factory row in the same style of opening.
No transmission cooler: No transmission oil cooler is built into this radiator.
Tank: Glass-filled plastic tank and EPDM seals, leak-tested at 150 percent of operating pressure.
Hoses: Inlet and outlet are 1-15/16 inch, inlet on the left and outlet on the right.
Part number: CSF 3944 crosses OEM 68322491AA.
Fitment: 2019-2024 Ram 2500, 3500, 4500, and 5500.
Does not fit: The wider 39-3/8 inch radiator, CSF 3937. A 2025-2026 Ram 2500 is on 3937, not this part.
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 repla[...]
A leaking or swollen tank on the 2019-2024 Ram 6.7L radiator lets the engine climb past normal temp on the highway. Replace it with the CSF 3944 if your core opening matches the narrower radiator. CSF uses a 2-row, 1-5/8 inch core in place of the factory 1-row 36 mm core.
- Build: Core width is 33-3/8 inches, height is 20-5/16 inches, and thickness is 1-5/8 inches, with two rows, so it rejects more heat than the thinner factory row in the same style of opening.
- No transmission cooler: No transmission oil cooler is built into this radiator.
- Tank: Glass-filled plastic tank and EPDM seals, leak-tested at 150 percent of operating pressure.
- Hoses: Inlet and outlet are 1-15/16 inch, inlet on the left and outlet on the right.
- Part number: CSF 3944 crosses OEM 68322491AA.
- Fitment: 2019-2024 Ram 2500, 3500, 4500, and 5500.
- Does not fit: The wider 39-3/8 inch radiator, CSF 3937. A 2025-2026 Ram 2500 is on 3937, not this part.
- 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. Measure the core. Order this radiator only if the opening matches 33-3/8 inches wide.