Having a optimally cooled transmission can make the difference between a smooth riding vehicle and janky gear shifts. Ensure smoother gear shifts with the 6.6L Duramax Mishimoto Transmission Cooler! Featuring an 84% greater core volume and a 125% increase in greater fin surface area, oncoming air is met with a large perforated design that encourages maximum cooling all across the transmission. The high-performance cooling technology is followed by a durable construction that uses a high-strength stacked plate design and CNC machined adapters that make it easy to connect the Mishimoto cooler. Additionally, the design elements of the Duramax Mishimoto cooler enables direct-fitment to your factory or AN cooling lines with the CNC machined adapters, tailor-made hoses, and direct fit brackets. Backed by a limited lifetime warranty and accident protection, picking up the 6.6L Duramax Mishimoto Transmission Cooler is an excellent upgrade choice for drivers who require enhanced cooling and optimized transmission health/operation.