1963-1966 C10/C15/K10/K15 Radiator for LS and LT Swap Auto Trans
Swapping an LS or LT powerplant and automatic gearbox into a 1963 to 1966 C10 or K15 chassis demands precise cooling control and respect for original hose paths. The 1963 to 1966 GM Truck Radiator (Auto Trans) relies on a crossflow design that routes coolant laterally through dedicated passages for both engine and transmission circuits. Its TIG welded aluminum core and tanks ensure reliable corrosion resistance and consistent temperature management during sustained loads such as towing or open road cruising. Direct port alignment matches factory inlet and outlet locations to simplify installation and preserve vintage engine bay aesthetics.
Ultimate TIG Welded Construction for Unmatched Durability
The radiator's tanks and core are assembled using TIG welding to deliver an even bond across all seams. This technique preserves aluminum's grain strength by controlling heat input, reducing stress concentrations that invite leaks under vibration or temperature swings. The seamless joints ensure the core stays flat over thousands of miles, supporting consistent coolant flow and pressure. Reinforced mounting rails maintain their geometry, so the assembly resists warping and fatigue whether towing heavy loads or cruising at speed. The precision weld integrity yields a dependable and lightweight component ready for demanding applications.
Integrated Crossflow Core Balancing Engine and Transmission Heat Management
This crossflow arrangement channels coolant laterally through dedicated passages for the V8 and the automatic gearbox in a single fin pack. Aluminum's high thermal conductivity pulls heat away from both circuits, while an optimized fin pattern maximizes air contact without restricting airflow. Consolidating the transmission cooler within the core eliminates external hoses and fittings, cutting leak risk and simplifying the coolant path. The result is stable operating temperatures during extended towing or highway runs, with rapid recovery when engine load fluctuates.
Premium Aluminum Alloy for Rapid Heat Transfer and Weight Reduction
Crafted entirely from a superior aluminum alloy, this radiator trades bulk for efficiency and strength. The metal's innate thermal properties draw engine and transmission heat into the core quickly, and its light weight helps improve front axle weight distribution for sharper steering feel. Aluminum also forms a natural oxide barrier that guards against corrosion from moisture and road debris. By shedding pounds over the original steel unit, drivers gain both performance gains and improved fuel economy under varied driving conditions.
Choice of Bare Aluminum or Epoxy Coating for Tailored Protection
Owners have the option of leaving the aluminum bare to develop its own protective oxide film or coating it in a durable black epoxy that shields against salt and grime. The uncoated finish offers a raw appearance that ages gracefully and sustains efficient heat rejection. Meanwhile, the epoxy coat bonds firmly under repeated thermal cycles, resisting chips and scrapes common in road service. Both finishes preserve the radiator's integrity and visual appeal within vintage engine bays, aligning with either a classic or custom look.
This radiator offers consistent temperature control and durable aluminum construction, and for the same radiator but with fans, see our 1963-1966 GM Truck Radiator (Automatic Transmission) with Fans.