radiator are cj style replacement aluminium but with my big tranny cooler in front i'm not sure if the heat transfer from the cooler to the radiator or the radiator is too smal when the cummins is pulling heavy weight ( uphill with a loaded trailer ---) 8000 pounds ) and the intercooler is not finished but i will be using water cooled intercooler ( smaller and more efficent ) .... but only this summer i will be able to confirm that !!