Derale 13221 High-Performance Frame Rail Transmission Fluid Cooler - Black | Heavy-Duty Cooling for Trucks, SUVs & Off-Road Vehicles | Improves Transmission Longevity & Towing Capacity

Prefect replacement and upgrade to the factory steel cooler from GM. That cooler was prone to rust (yeah, who ever heard of a metal oil cooler) and leakage. With some new 90 degree 6AN fittings and some Oetiler 18.5mm clamps the upgrade was ready to imstall. I cut away the front portion of the lower channel (1-2 inches) to facilitate installation. I used a 12 gauge AL plate to support the lower mounting hole. The AL piece actuallu sinks additional heat from the cooler. Excellent in every way. The cooler fits perefect between the condenser/cooler and the side channel. 2000 Silverado 2500 4WD, extended cab.