Cooler Bypass Delete 19-23 GM 8L90

The Cooler Bypass Delete 19-23 GM 8L90 from BD Diesel is a direct-fit transmission cooler bypass elimination kit designed specifically for 2019–2023 GM trucks equipped with the 8L90 eight-speed automatic transmission. This upgrade is essential for improving thermal management, as factory bypass valves can lead to inadequate cooling during cold starts and light-load driving.

By permanently eliminating the bypass circuit, this kit ensures that transmission fluid flows through the cooler immediately, enhancing thermal stabilization and hydraulic performance. The design blocks the factory bypass valve passage, compelling all fluid flow through the external cooler core, which helps maintain consistent temperatures throughout the transmission.

This bypass delete is particularly beneficial for owners of 2019–2023 Silverado and Sierra trucks who frequently tow or operate in high-ambient conditions. The lightweight construction integrates seamlessly into existing transmission assemblies, requiring no modifications to factory cooling lines or mounting points.