Auto Trans Radiator for LS and LT Swaps in 1963-1966 C/K-Series Chevy and GMC Trucks
When you drive a 1963-1966 C10, C15, K10 or K15 truck with an LS or LT engine, overtaxed automatic transmissions can push cooling systems beyond their limits. The 1963-1966 GM Truck Radiator (Auto Trans) ensures steady coolant flow through both the core and transmission passages to prevent heat spikes during heavy towing or extended highway runs. Its 100 percent TIG welded aluminum design resists corrosion and sheds nearly 20 pounds compared to stock steel units, making installation on C/KSeries frames straightforward and dependable.
Precision TIG Welded Aluminum Build
This radiator features 100 percent TIG welded aluminum tanks and core for exceptional joint integrity and leak-free operation. TIG welding creates very narrow heat affected zones, preserving the metal's strength and allowing for precise alignment with C10, C15, K10 and K15 frames. By using premium aluminum throughout, the design sheds nearly 20 pounds compared to original steel units while maintaining rigidity under vibration and load. The fully welded construction also resists fatigue and eliminates potential weak points where coolant or transmission fluid could escape.
Optimized Thermal Flow for LS and LT Engines
Internal coolant passages are engineered to balance flow between the core and transmission channels, ensuring steady heat rejection even under heavy towing or sustained highway speeds. Aluminum's natural conductivity rapidly transfers heat away from both engine and automatic transmission fluids, preventing temperature spikes that can degrade performance or shorten component life. The large crossflow core promotes uniform distribution of coolant, reducing hot spots and preserving operating consistency in hot climates or during grueling haul duty.
Corrosion Resistant Aluminum with Custom Finishes
Choose between an uncoated bare aluminum finish for a classic factory look or a durable black epoxy coating that adds a robust barrier against road salts and moisture. The raw aluminum surface naturally forms a protective oxide layer to guard against rust, while the epoxy option provides additional chemical and abrasion resistance in harsher environments. Both finishes are made in the USA and contribute to long lasting visual appeal, helping protect your investment and maintain resale value.
Count on MuscleRods for dependable cooling performance. For the same radiator but with fans see our 1963-1966 GM Truck Radiator (Automatic Transmission) with Fans.