Sure-Cool Transmission Cooler System

The Superior Transmission Parts STL010 Sure-Cool System is a patented thermal bypass valve engineered by TransLab for automatic transmissions. It offers a built-in safety bypass and is recommended during transmission rebuilds or as preventive maintenance during routine service. This cooler system upgrade aims to reduce average operating temperatures by as much as 30%, thereby decreasing the risk of overheating under load. By maintaining optimal temperatures, it also helps to reduce the risk of planetary damage and increases the overall life of the ATF. 21-NA-199. It is important to note that the STL010 system is specifically patented and manufactured in the USA. Buyers are cautioned to seek only the original Sure-Cool STL010, as counterfeits are prevalent and may be out of specification, potentially damaging the vehicle. All genuine systems are laser-etched with "SURE~COOL®" and the corresponding Superior part number, such as STL010. The STL010 fits ALL 2014-up 6L45/50 and 6L80/90 transmissions, as well as all 2015-up 8L45/50 & 8L90 (including 8L80 Euro models) with external aluminum blocks on the driver's side. It also fits 2017-2019 L5P Allison transmissions.