Transmission Cooler Line Set

Features:

• Fits 2011-2014 LML Duramax trucks
• Heavy-duty high-flow transmission lines
• 5/8-inch increased diameter hose design
• Flexible lines simplify installation
• Helps replace leaking factory lines
• Explosion-proof protective hose sleeve
• Durable AN fitting connections
• Includes complete installation hardware
• Improves transmission fluid flow
• Heavy-duty hose wrap protects lines
• Not compatible with cab chassis models
• Backed by one-year limited warranty

Stop Fighting Leaking Factory Transmission Lines

Nothing is more frustrating than spotting transmission fluid dripping from worn factory cooler lines, especially on a truck that still has work to do. The Fleece Transmission Cooler Line Set is designed to give your 2011-2014 Silverado or Sierra 2500HD and 3500HD with the 6.6L LML Duramax a far more durable and dependable solution than the restrictive factory setup. Built with heavy-duty flexible hoses and increased diameter 5/8-inch line sizing, this kit improves transmission fluid flow while helping reduce the risk of future leaks and failures. That added flow becomes especially valuable for trucks used for towing, hauling, or daily driving in demanding conditions where transmission temperatures can quickly become a concern. Additionally, the explosion-proof polyester protective sleeve helps shield the lines from abrasion and harsh underbody conditions, giving the system added long-term durability. Fleece also includes AN fittings, mounting hardware, hose clamps, locking cable ties, and cable clamps to make the installation process as complete and straightforward as possible. Whether you are replacing damaged stock lines or upgrading for added reliability, this kit delivers the confidence and durability serious Duramax owners appreciate.

Engineered For Improved Flow And Long Term Reliability

Fleece designed this transmission cooler line kit specifically for the LML Duramax platform using larger 5/8-inch inner diameter hoses to improve transmission fluid flow compared to the factory lines. The increased diameter helps reduce restriction within the cooling system, allowing the transmission to maintain more consistent fluid circulation under demanding operating conditions. Each line is constructed using flexible heavy-duty hose material that simplifies routing and installation while also improving resistance to cracking and fatigue over time. Additionally, the included explosion-proof polyester hose sleeve provides an added layer of protection against abrasion, heat exposure, and road debris commonly encountered underneath heavy-duty trucks. The kit also features durable -10AN style fittings with O-ring adapters that help provide secure sealing and dependable connections throughout the transmission cooling system. Fleece supplies all necessary installation hardware, including washers, double hose clamps, locking cable ties, and fir tree cable clamps to help streamline the installation process. This kit is intended for standard pickup applications and is not compatible with cab and chassis models. Backed by a one-year limited parts warranty, this transmission cooler line set offers an excellent combination of durability, improved flow capacity, and installation convenience for hard-working LML trucks.

Fitment: 2011, 2012, 2013, 2014 GM Sierra/Silverado 2500HD/3500HD 6.6L Duramax LML

Notes:

• Designed for 2011-2014 LML Duramax pickups
• Not for cab and chassis applications
• Replaces leaking factory transmission cooler lines
• Kit includes three 5/8-inch ID lines
• Includes AN fittings and O-ring adapters
• Includes clamps, washers, and cable ties
• Uses explosion-proof polyester hose protection sleeve
• Increased diameter over stock transmission lines
• Backed by a one-year limited parts warranty
• California Proposition 65 warning applies

Install Instructions