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 suppo