Terminator X MAX users, unlock the full potential of your GM 6L80/6L90e 6-speed transmission with Holley EFI’s Transmission Controller. Using Terminator X MAX along with our Holley EFI Transmission Harness and handheld, you can control GM’s 6 Speed transmissions in addition to complete engine control. It features an easy to use interface that lets you raise and lower shift points, make changes for tire size and gear ratio, as well as read error codes from the transmission directly.

We also support 2nd shift pattern modes, such as Tow Haul or Sport mode. With the Terminator X V3 Software, you'll also have access to advanced features like shift mode, tap up/down shifting, torque management, and full parameter customization, allowing you to make your vehicle perform like never before.