Excessive heat is the #1 killer of transmissions. Proper cooling of your transmission fluid is one of the most important things that you can do to increase the life of your transmission. Bar and Plate style coolers represent the latest technology. Within each repeating section, the internal alternating square pattern (bars) slow the high-temperature fluid which creates a greater transfer of heat radiated through the thin sheet (plate) and cooled by the louvered aluminum fins. The PPE Bar and Plate Transmission Cooler is optimized for your specific GM Allison 1000-2000 Series 6.6L Truck. When the mainline pressure is increased with upgrades such as a high-performance transmission kit your transmission generates additional heat. A PPE Performance Transmission Cooler is critical in such situations. PPE's Performance Transmission Cooler is a direct bolt-on replacement part. Covered by a limited lifetime warranty. 4 different variations are available: 2006-2010 GM Allison 1000-2000 6.6L Trucks 2011-2014 GM Allison 1000-2000 6.6L Trucks 2015-2016 GM Allison 1000-2000 6.6L Trucks 2017-2020+ GM Allison 1000-2000 6.6L Trucks Hardware necessary for installation is included (e.g. bolts, nuts, brackets).