Peterbilt 389 Glider Transmission Coolers are designed to maintain optimal temperature and performance for your rig?s transmission system. Built with high-quality materials, these coolers offer exceptional heat dissipation, extending the life of your transmission components. Whether hauling heavy loads or driving long distances, these coolers ensure your Peterbilt 389 runs smoothly and efficiently. Upgrade your truck with these essential transmission cooling solutions for reliable, heavy-duty performance.