Shop for Aftermarket Transmission Coolers for the Mack CV/GU. Keep your Mack CV/GU running smoothly with our durable transmission coolers. Built from tough stainless steel and aluminum, these coolers prevent overheating and extend your transmission s life. Whether you re replacing or upgrading, we ve got options to fit your Mack perfectly. Stay cool on the road with reliable cooling solutions designed for heavy-duty performance.