Hayden 777 Automatic Transmission Oil Cooler

Hayden 777 Trans Oil Cooler Overview

The Hayden 777 Trans Oil Cooler is a heavy-duty automatic transmission oil cooler built for add-on cooling with the factory cooler. It uses an aluminum core, integrated bracket design, and a black finish for a clean, durable installation on a wide range of trucks, vans, and SUVs.

Part of the Hayden Trans Oil Cooler line, this Rapid-Cool style unit is performance rated and sized for applications that need supplemental transmission temperature control. The Hayden 777 is a practical choice for Ford F-250 Super Duty, Chevrolet Silverado, GMC Sierra, and Ram heavy-duty fitments where extra cooling is needed.

• Automatic transmission oil cooler with Rapid-Cool style construction
• Heavy-duty plate-and-fin design for supplemental cooling
• Aluminum core with black finish
• Integrated bracket and mounting hardware included
• Performance rated for add-on cooling with factory cooler setups
• Connector fitting: 7/8"-14 JIC flare, male
• Inlet and outlet: female
• Dimensions: 12.9375 in. length, 6.625 in. height, 1.750 in. thickness

Detailed Product Description

The Hayden 777 is a trans / engine oil cooler engineered for vehicles that need additional heat rejection beyond the factory cooling system. Its 14-row aluminum core and heavy-duty plate-and-fin construction help manage transmission fluid temperature in demanding towing, hauling, and stop-and-go driving conditions. The integrated bracket design simplifies mounting, while the black finish gives the cooler a clean, service-ready appearance.

This part cross-references Bosch 16541 for the same application. It is a direct fit for many 1990-2016 truck and van applications, including 2003-2016 Ford F-250 Super Duty, 2003-2016 Ford F-350 Super Duty, 2006-2015 Chevrolet Express 2500, and 2008-2015 GMC Sierra 3500 HD. The Hayden 777 part number is also commonly searched for heavy-duty transmission cooler replacement and add-on cooling upgrades.

Common Uses

• Reduces transmission fluid heat during towing and hauling
• Addresses elevated transmission temperatures in heavy-duty service
• Supports add-on cooling when the factory cooler is not enough
• Helps maintain more stable fluid temperatures in stop-and-go driving
• Serves as a replacement or upgrade for transmission cooler service

Installation Notes

Verify connector style and thread size before installation. Some applications listed in the fitment data note that a 5/8" snap-in adapter is required to connect to 7/8"-14 O-ring threads. Confirm available space for the cooler’s 12.9375-inch length and 1.750-inch thickness, and match the vehicle’s factory cooler routing before final mounting.

Compatible With 1990-2016 Ford, Chevrolet, GMC, Dodge, and Ram applications listed in the fitment data, including Ford F-250 Super Duty, Chevrolet Silverado 2500 HD, GMC Sierra 2500 HD, and Ram 3500.

Quality Assurance

Hayden Trans Oil Cooler products are built for performance-rated cooling applications and use aluminum construction with integrated mounting features for service-focused installations. The Hayden 777 part number is specified for heavy-duty transmission cooling use across a broad range of factory-cooler add-on applications.