Keep your Mack CH/CHN/CHU transmission cool with our durable transmission coolers. Built tough with stainless steel, these coolers prevent overheating and keep your truck performing at its best. Whether it s a 2-inch coolant tube or an 18x7x1.5-inch oil cooler, we ve got the right fit for your rig. Upgrade or replace with these long-lasting, reliable components and keep your transmission in top shape.