Hayden 779 Automatic Transmission Oil Cooler

Hayden 779 Trans Oil Cooler Overview

The Hayden 779 is a heavy-duty automatic transmission oil cooler built for transmission and engine oil cooling applications. It uses an aluminum core, a black finish, and a Rapid-Cool style design to support heat management in demanding service conditions. This Hayden Trans Oil Cooler is a direct fit for select Ram 2500 and Ram 3500 trucks from 2011-2015.

Key Features

• Part number 779 from Hayden Trans Oil Cooler
• Heavy-duty Rapid-Cool style construction
• Aluminum core material with black finish
• Integrated bracket design
• Female 7/8" - 14 threaded O-ring inlet and outlet connections
• Performance rated for transmission and engine oil cooling use
• Mounting hardware included

Product Details

Hayden 779 is a plate-and-fin style cooler with 28 core rows and an overall height of 11.25 inches, an overall width of 1.75 inches, and a length of 11.13 inches. The aluminum construction supports efficient heat transfer, while the integrated bracket and threaded O-ring fittings simplify placement in the cooling circuit. This part is listed as a non-OE replacement and is intended for heavy-duty service where fluid temperature control matters. For buyers searching Ram 2500 transmission oil cooler or Ram 3500 engine oil cooler replacement, Hayden 779 provides a fitment-specific option for 2011-2015 trucks.

This part cross-references 243779 and 500028 for the same application.

Common Problems This Cooler Addresses

• High transmission fluid temperatures during towing or hauling
• Heat buildup in automatic transmission fluid under load
• Reduced cooling efficiency from a worn or undersized cooler
• Fluid temperature spikes in heavy-duty Ram truck use
• Need for a replacement transmission or engine oil cooler with threaded O-ring connections

Installation Notes and Fitment

Fits 2011-2015 Ram 2500, N/A; Premium Plate and Fin Cooler Heavy Duty; Trans Oil Cooler. Fits 2011-2015 Ram 3500, N/A; Premium Plate and Fin Cooler Heavy Duty; Trans Oil Cooler. Verify inlet and outlet thread size, mounting location, and available space before installation. Use the integrated bracket and included mounting hardware to secure the cooler, and confirm all fluid line connections are clean and properly seated before returning the vehicle to service.

Quality Assurance

Hayden is known for cooling-system components used in automotive and heavy-duty applications. Part number 779 is built with an aluminum core and performance-rated construction for transmission oil cooler service on select Ram trucks.