Vehicle Fitment For 2001-2005 Chevrolet Silverado 2500 HD w/ 6.6L Duramax LB7/LLY For 2001-2005 Chevrolet Silverado 3500 HD w/ 6.6L Duramax LB7/LLY For 2001-2005 GMC Sierra 2500 HD w/ 6.6L Duramax LB7/LLY For 2001-2005 GMC Sierra 3500 HD w/ 6.6L Duramax LB7/LLY Radiator Size Row: 4 Row Core Material: Full Aluminum Core and Tank: All Aluminum Core Size : 27.3" x 17.91" Overall Size : 39.37" x 20.86" Inlet/Outlet :1 7/8'' & 1 7/8'' Description PRO Aluminum Radiator is designed to provide maximum cooling efficiency to prevent premature engine failure. PRO Aluminum Radiator is at least 30%-45% more efficient than stock ones. Most importantly, it has a much higher capacity for coolant than stock ones, which means that your cooling system will be more efficient and will be more resistant to temperature surges in racing applications. Warranty: 5 YEARS