Fleece Performance 11-14 GM Duramax 2500/3500 Heavy Duty Trans Cooler Lines

The Fleece Performance 11-14 GM Duramax 2500/3500 Heavy Duty Trans Cooler Lines are high-performance replacement transmission lines designed for Duramax LML trucks from 2011 to 2014. Constructed with a heavy-duty, high-flow, flexible polyester hose and an increased diameter of 5/8 inch over stock, these lines improve fluid flow and durability. The kit includes three transmission lines with AN fittings, six O-ring to -10AN fittings, large OD washers, double hose clamps, locking cable ties, and fir tree cable clamps, providing a comprehensive upgrade solution. The explosion-proof polyester hose protection sleeve enhances reliability and protects against future failures, making these lines suitable for demanding applications.

Designed specifically for 2011–2014 GM Duramax 2500 and 3500 trucks, these heavy-duty lines are intended as a direct replacement for OEM components. Not suitable for cab and chassis applications, they are ideal for improving transmission cooling and preventing leaks in towing, heavy-duty, or high-performance use cases. The kit’s components are engineered for easy installation and enhanced flow, ensuring long-lasting performance and protection. This upgrade is perfect for owners seeking a robust, high-capacity solution to maintain optimal transmission operation.