Cummins Transmission Coolers & Lines

Transmission coolers are typically mounted in front of the radiator or air conditioning condenser where they receive maximum airflow. On heavy equipment, they're often integrated into the cooling package alongside the radiator and charge air cooler. Proper placement ensures adequate airflow, minimizes line length, and protects the cooler from road debris and heat soak.

The best transmission cooler is one sized correctly for your Cummins engine's heat load and equipment duty cycle. Stacked-plate coolers offer the highest cooling efficiency for heavy-duty applications, while tube-and-fin designs provide reliable performance for standard use. OEM-equivalent options ensure proper fitment and consistent fluid flow, reducing the risk of transmission overheating and premature wear.

Sizing depends on your Cummins engine's horsepower, the equipment's load conditions, and ambient operating temperatures. Heavier loads, towing, or high-temperature environments require higher-capacity coolers. Check your equipment's OEM specifications or consult our team with your model details to match the correct cooler capacity and fitment.

Yes, replacing transmission cooler lines is a manageable DIY task if you have basic mechanical skills and the correct fittings. Ensure the transmission is drained or fluid loss is minimized, match line diameter and fitting types exactly, and torque connections properly to prevent leaks. If unsure, professional installation is recommended for critical heavy-duty applications.

Transmission cooler lines should be inspected during routine maintenance intervals, typically every 5,000-10,000 miles or per your equipment's service schedule. Check for cracks, corrosion, loose fittings, and fluid leaks. Heavy-duty and off-road equipment operating in harsh conditions may require more frequent inspections to prevent transmission fluid loss and overheating.

OEM transmission coolers are made to original manufacturer specifications, while aftermarket coolers can range from economy options to OEM-equivalent quality parts. High-quality aftermarket coolers, like our ICEBOX line, match OEM fitment and performance at a lower cost, offering reliable cooling capacity without sacrificing durability or compatibility.

Radiator Supply House offers transmission coolers and lines compatible with Cummins engines across 300+ equipment manufacturers, including Caterpillar, Freightliner, John Deere, JCB, and Volvo. These parts serve multiple industries, including construction equipment (excavators, loaders, graders), agricultural machinery (tractors, combines), commercial trucking (long-haul trucks), and industrial power equipment (generators, compressors).