Transmission Cooler Line Set

Features:

• Fits 2015-2016 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

Give Your Allison The Heavy Duty Fluid Flow It Needs

Leaking factory transmission cooler lines are one of those problems that seem small at first until they leave you stranded or dealing with overheating issues under load. The Fleece Transmission Cooler Line Set gives your 2015-2016 Silverado or Sierra 2500HD and 3500HD with the 6.6L LML Duramax a far stronger and more reliable solution built for real truck use. Whether your truck spends its time towing heavy trailers, hauling equipment, or simply racking up miles every week, these heavy-duty high-flow lines are designed to improve durability and fluid circulation where the factory setup falls short. The larger 5/8-inch hose diameter helps improve transmission fluid flow, which can be especially beneficial when the transmission is working harder in demanding driving conditions. Additionally, the flexible hose design makes installation cleaner and easier while helping reduce stress on the lines during engine and chassis movement. Fleece also adds an explosion-proof protective hose sleeve that helps guard against abrasion and harsh underbody conditions, giving the system added long-term protection. With all the necessary fittings, clamps, and mounting hardware included, this kit delivers a complete upgrade that helps eliminate one of the most common weak points found on hard-working LML trucks.

Designed To Improve Transmission Cooling System Reliability

Fleece engineered this transmission cooler line set specifically for 2015-2016 LML Duramax applications using larger diameter 5/8-inch inner diameter hoses to improve transmission fluid flow over the restrictive factory line design. The increased flow capacity helps support more consistent fluid circulation throughout the transmission cooling system, which becomes increasingly important in towing, high-load, and elevated temperature conditions. Each line is constructed from flexible heavy-duty hose material that offers improved resistance to cracking, fatigue, and long-term wear compared to aging factory lines. Additionally, the included explosion-proof polyester protective sleeve helps shield the hoses from abrasion, heat exposure, and debris commonly encountered underneath heavy-duty trucks. Fleece equips the system with durable -10AN style fittings and O-ring adapters to help provide secure, leak-resistant connections throughout the installation. The kit also includes large OD washers, double hose clamps, locking cable ties, and fir tree cable clamps to simplify the installation process and reduce the need for sourcing additional hardware. This transmission cooler line kit is intended for standard pickup models and is not compatible with cab and chassis applications. Backed by a one-year limited parts warranty, this system provides an excellent balance of durability, improved fluid flow, and long-term reliability for demanding Duramax applications.

Fitment: 2015, 2016 GM Sierra/Silverado 2500HD/3500HD 6.6L Duramax LML

Notes:

• Designed for 2015-2016 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