1970-1981 Pontiac Firebird LS Swap Radiator (Auto Trans) with Fans
When planning an LS engine conversion in a Pontiac Firebird from 1970 through 1981 with automatic transmission, precise coolant management is essential. The 1970-1981 Firebird Radiator (Auto Trans) with Fans pairs a TIG welded aluminum core and matching tanks to resist leaks under sustained heat. Two electric fans engage at preset temperatures to maintain coolant flow in stop and go traffic or spirited throttle events. You can choose a natural bare aluminum surface or a black epoxy finish, both assembled in the USA. This radiator mounts to factory F Body brackets and aligns inlet and outlet ports for a direct fit while preserving chassis clearance and hose routing.
Radiator Overview
The 1970–1981 Firebird Radiator for automatic transmission applications is engineered specifically for LS engine conversions. This unit arrives ready to install and includes dual high-performance fans installed at the factory, delivering consistent airflow across the full core face. By positioning both fans to draw and push air in tandem, heat rejection is maximized at idle and highway speeds alike. The result is a stable coolant temperature under heavy load and in stop-and-go traffic, a vital benefit when preserving automatic transmission line pressure and internal lubrication.
Construction and Cooling Efficiency
Every radiator is crafted from high-grade aluminum, combining a dense fin pattern core with reinforced extruded side tanks. All joints are TIG welded to create a leak-proof seal and facilitate smooth coolant passage between header and core. Aluminum offers exceptional thermal conductivity and resists corrosion over time, ensuring the unit maintains peak performance year after year. The dense fin arrangement increases surface area for heat transfer, while the reinforced tanks withstand repeated pressure cycles without deformation. Proudly made in the USA, this radiator meets strict quality controls at every stage.
Compatibility and Integration
This radiator is a direct fit for 1970 through 1981 Firebird chassis when performing an LS swap with MuscleRods mounting solutions. The core support and mounting flanges align precisely with existing MuscleRods crossmember locations, guaranteeing correct engine placement and proper drivetrain angles without additional brackets or spacers. Cooling lines and transmission cooler fittings attach using factory-style ports, minimizing plumbing changes. The preinstalled fan assembly plugs into standard GM harness connectors, reducing wiring labor and avoiding guesswork on relay or switch configurations.
For the same radiator but without fans, consider our 1970-1981 Firebird Radiator (Automatic Transmission).