1963-1966 C10/C15/K10/K15 Radiator for LS and LT Swaps with Auto Trans
The 1963-1966 GM Truck Radiator (Auto Trans) has been engineered to tackle the unique heat output of LS and LT V8 engine swaps with automatic transmissions in C10, C15, K10 and K15 frames. Featuring a crossflow finned core and integrated transmission passages, it channels coolant laterally through the engine and transmission circuits for balanced temperature control under towing or highway travel. Direct port alignment with factory inlet and outlet locations simplifies installation, while high grade aluminum construction and precision TIG welding deliver corrosion resistance and dependable service life.
100 Percent TIG Welded Aluminum Assembly for Enduring Strength
This radiator employs fully TIG welded joints between the tanks and the core to create a uniform metal bond that withstands constant vibration and thermal cycles. By precisely controlling the weld bead and heat input, the aluminum grain structure remains intact, reducing microscopic stress points that can cause leaks over time. The result is a robust seal that resists fatigue during towing or spirited highway use. Welded seams also add rigidity to the entire assembly, helping to maintain core flatness and ensuring even tube contact for consistent coolant flow. This construction method elevates durability without adding unnecessary weight, so the radiator delivers reliable service mile after mile.
Crossflow Finned Core with Integrated Transmission Cooling Channels
Designed for LS and LT V8 swaps mated to an automatic gearbox, the crossflow finned core channels coolant laterally through distinct engine and transmission circuits in one compact unit. Aluminum's high thermal conductivity accelerates heat rejection from both circuits, while an optimized fin density boosts surface area without impeding airflow. Integrated transmission passages mean there is no need for an external cooler or extra fittings, cutting plumbing complexity and potential leak points. This balanced flow strategy keeps both engine and transmission temperatures in check under sustained loads such as highway towing or off-grid excursions. The unified core design also increases radiator efficiency by sharing cooling capacity between the two systems when demand fluctuates.
Coating Options for Corrosion Resistance and Custom Underhood Appeal
Builders can choose a natural bare aluminum finish or an attractive black epoxy coat, each applied to precise tolerances in the USA. The uncoated surface forms its own protective oxide layer that guards against rust, while showcasing raw metal that complements vintage engine bays. In contrast, the epoxy finish adds a uniform barrier to road salt, road grime, and moisture without compromising heat transfer. Both coatings adhere tightly under thermal stress and resist chipping or flaking over years of use. This choice lets installers tailor the radiator's appearance to their build goals while maintaining reliable corrosion protection from day one.
Precision Port Alignment for Simplified C10/C15/K10/K15 Installation
Ports for inlet, outlet, and transmission lines are located to match the original 1963-1966 frame rail and chassis openings, eliminating the need for adapters or custom brackets. This direct fit approach streamlines installation by preserving factory hose routing and bracket mounting points. By avoiding modifications, installers enjoy a cleaner engine bay layout and faster project completion. The radiator sheds nearly twenty pounds compared to the original steel unit, improving front axle response and steering feel. Overall, precision alignment reduces labor time, minimizes potential failure points, and delivers a professional finish in LS and LT swap applications.
Count on this radiator to maintain optimal temperatures; for the same radiator but with fans see our 1963-1966 GM Truck Radiator (Automatic Transmission) with Fans.