"Tests have proven that a 20 degree drop in transmission fluid temperature can double the life of automatic transmission components. Cooler tranny oil gives more reliable, consistent shifts under racing conditions, and prevents transmission damage under extreme towing conditions. These coolers provide a reliable means of cooling your auto transmission. Cooler capacity is based on GVW rating. Select cooler size based on severity of service. GVW: 18,000. Number of Passes: 6. Dimensions: 7-1/2 x 15 x 3/4 inch"