Earl's Performance Transmission Cooler Adapters for GM Automatic Transmissions

Earl's Performance Transmission Cooler Adapters provide a precision-engineered solution for integrating aftermarket transmission cooling systems into late-model GM automatic transmissions. Designed to work directly with the factory transmission thermostat housing — either bolting onto it or replacing it entirely — these adapters eliminate the need for custom fabrication, stacked fittings, or makeshift plumbing. The result is a clean, professional foundation for an external transmission oil cooler installation.

Key Features:

• Billet aluminum construction with an anodized finish for long-term corrosion resistance and durability
• AN male flare ports for direct, leak-free integration with AN braided hose assemblies and Earl's transmission oil coolers
• O-ring seal design ensures reliable, leak-free performance under demanding operating temperatures and pressures
• Engineered to interface with the GM factory transmission thermostat housing — no custom fabrication required
• Compatible with Earl's transmission oil coolers and standard AN plumbing components
• Multiple configurations available to suit a range of late-model GM automatic transmission applications

The Earl's Performance Advantage

Earl's Performance Plumbing brought aviation-grade fluid transfer technology to the automotive performance market over five decades ago, and top-level racing teams continue to rely on Earl's products today. These transmission cooler adapters reflect that same legacy — purpose-built for performance enthusiasts, professional builders, and racing teams who demand dependable transmission thermal management. The AN fitting design delivers superior sealing and long-term reusability compared to traditional compression fittings, making this adapter line an ideal choice for high-performance, racing, towing, and heavy-duty street applications.