Hayden 778 Automatic Transmission Oil Cooler

Hayden 778 Trans Oil Cooler Overview

The Hayden 778 Trans Oil Cooler is a heavy-duty Rapid-Cool transmission and engine oil cooler built with an aluminum core and integrated bracket design. It measures 12.9375 inches long, 8.875 inches high, and 1.750 inches thick, with a black finish and performance-rated construction for demanding cooling applications.

Compatible With Ford F-250 Super Duty and F-350 Super Duty applications, as well as Chevrolet Silverado, GMC Sierra, Ram, Express, Savana, and related heavy-duty platforms across a broad range of model years. The Hayden 778 part number is also referenced in aftermarket interchange listings for direct replacement research.

Key Features

• Heavy-duty Rapid-Cool transmission oil cooler design
• Aluminum construction with black finish
• Integrated bracket for cleaner mounting support
• Performance-rated cooler for transmission and engine oil applications
• Threaded O-ring connector style with 7/8"-14 male fitting
• Female inlet and outlet connections
• Core row quantity: 21
• Overall dimensions: 12.9375 in. long, 8.875 in. high, 1.750 in. thick

Product Details

Hayden Trans Oil Cooler 778 is part of the Trans Oil Cooler line and is built for vehicles that need additional fluid temperature control under load, towing, stop-and-go driving, or extended service use. Its plate-and-fin style construction and compact footprint make it a practical choice for trucks, vans, and SUVs that rely on stable transmission temperatures. This part cross-references select aftermarket numbers such as 0778 and 16542 for the same application.

Fits 2003-2016 Ford F-250 Super Duty, N/A; Fits 2003-2016 Ford F-350 Super Duty, N/A; Fits 2006-2015 Chevrolet Express 2500, N/A; Fits 1996-2002 Chevrolet Express 2500, N/A; Fits 2006-2015 Chevrolet Express 3500, N/A; Fits 1996-2002 Chevrolet Express 3500, N/A; Fits 2012-2015 Chevrolet Silverado 2500 HD, N/A; Fits 2006-2010 Chevrolet Silverado 2500 HD, N/A; Fits 2012-2015 Chevrolet Silverado 3500 HD, N/A; Fits 2007-2010 Chevrolet Silverado 3500 HD, N/A; Fits 2006-2015 GMC Savana 2500, N/A; Fits 1996-2002 GMC Savana 2500, N/A; Fits 2006-2015 GMC Savana 3500, N/A; Fits 1996-2002 GMC Savana 3500, N/A; Fits 2008-2015 GMC Sierra 2500 HD, N/A; Fits 2008-2015 GMC Sierra 3500 HD, N/A; Fits 2011-2015 Ram 2500, N/A; Fits 2011-2015 Ram 3500, N/A.

What It Helps Address

• High transmission fluid temperatures during towing or hauling
• Heat buildup in heavy-duty truck and van cooling systems
• Reduced cooling capacity in older or stressed oil cooler assemblies
• Need for a direct-fit style cooler on supported Ford, Chevrolet, GMC, and Ram applications
• Service replacement for vehicles with threaded O-ring cooler connections

Installation Notes and Tips

Verify connector style, inlet and outlet orientation, and available mounting space before installation. Some listed applications note use of a 5/8" snap-in adapter to connect to 7/8"-14 O-ring threads, so confirm the vehicle’s cooler line setup before ordering. Body fitment includes multiple heavy-duty trucks and vans, including Ford F-250 Super Duty, Chevrolet Silverado 2500 HD, and GMC Sierra 3500 HD applications.

Quality Assurance

Hayden is a recognized cooling-system brand, and the 778 Trans Oil Cooler is built as a performance-rated heavy-duty component for transmission and engine oil cooling service. Confirm all dimensions and connector specifications against the vehicle before installation to ensure proper fitment.