67-76 Chevy GMC Pickup Truck LS Swap Aluminum Radiator AT and 12 Inch Fan Kit Cold Case Radiators1967 1976 GM Truck LS Swap Aluminum Performance Radiator and 12 Inch Fan Kit. To run an LS swap on your classic truck, you can run this radiator and either run a separate transmission cooler or re route your trans lines to the driver side of the radiator OR run our GMT558A standard high flow C10 radiator with a 2 piece upper hose that goes to the drivers side inlet (use a 'T' fitting in between the 2 hoses for the steam port). These COLD CASE