03-05 GM 6.6L LB7 + LLY Duramax Randy's Fluidyne Heavy Duty Transmission Cooler

Please note: A 20% cancellation fee will be charged for canceled Randy's Transmission items after purchase. If lead time is a concern, please contact us BEFORE making your purchase to avoid a cancellation fee. 

When it comes to keeping your transmission cool, not all coolers are created equal. Fluidyne’s bar plate design and dual-pass flow maximize heat dissipation, ensuring your trans stays at optimal temps even under extreme loads.
More fluid, more cooling, more durability—because heat is the problem, and this is the solution.

Upgrade your transmission cooling system with the Fluidyne High Performance Bar and Plate Transmission Fluid Cooler, engineered for the 2003-2005 GM 6.6L Duramax. This advanced cooler provides over four times the heat dissipation capability compared to factory models, ensuring optimal transmission temperatures and enhanced efficiency.

Why Cooling Matters:
Heat is a major enemy of transmission longevity. For your 2003-2005 Chevy/GMC 6.6L Duramax, whether used for towing, fleet duties, or performance driving, maintaining optimal transmission temperatures is crucial.

Advanced Bar and Plate Design:
The Fluidyne cooler features a heavy-duty bar and plate design, Featuring the highest density of fins per inch on the market- offering superior durability and cooling efficiency. This design outperforms the stock unit by significantly increasing both core volume and fin surface area—193% more. This means better heat dissipation and improved transmission performance.

Larger and More Efficient:
Our cooler is designed to be substantially larger than the stock cooler, providing enhanced cooling capacity. The increased core volume and fin surface area help ensure your transmission stays within the optimal temperature range, even under heavy loads.

Built to Last:
Constructed with aerospace-grade aluminum, the Fluidyne cooler is engineered for maximum durability. TIG welding ensures a robust and leak-free construction, while fully welded internal splitter plates prevent fluid contamination. Pressure tested to 250 psi, it can handle extreme conditions with ease. Additionally, the cooler is powder-coated with a specialized heat-wicking compound and features a proprietary fin design to enhance thermal performance.

Easy Installation:
The Fluidyne cooler features pipe thread connections, offering a wide variety of connecting solutions to best fit your needs. It comes with CNC-machined adapters for a seamless, leak-free connection to your existing transmission lines or fully custom lines. Its your truck; customize it the way you want. 

Lifetime Warranty:
Randy's stands by the quality of their product with a Lifetime Warranty. This guarantees worry-free performance and peace of mind for as long as you own your truck.

Key Features:

• Over four times the heat dissipation capacity compared to stock coolers
• Direct bolt-in replacement
• Maximum fin density for optimal cooling
• Fully welded internal splitter plates to prevent fluid contamination
• Tested up to 250 PSI against leaks and ensure optimal performance. 
• Aerospace-grade aluminum construction with bar and plate design
• Proprietary fin design for enhanced thermal performance
• Powder-coated with a specialized heat-wicking compound
• Easy installation using factory mounts
• Limited lifetime warranty

Randy's: RT-A1-0305