The TCM425 is designed to work with the GM line of 5 speed automatics including the RWD 5L40E and 5L50E.
This is a Fully Automatic controller it will auto shift through all forward gears once in DRIVE the same as a OEM controller.

All settings are made with the included UI-240 color programmer/monitor through a simple to navigate menu driven display and the 4 buttons. Each screen has a description of the function and we include a step by step set of instructions.

No laptop required!

The programmer is secured with a pass code to prevent unauthorized changes.

The monitor and settings screens can be easily changed to KPH and Centigrade in the settings menu.

All shift points are adjusted individually for each UP shift and DOWN shift based on MPH(or KPH) and TPS input.

There are 3 automatic shifting modes that can be individually configured and saved to Nonvolatile memory

“Normal – Sport – Track“.

It also has Manual Shifting Mode which is automatically engaged when you use a optional paddle or ratchet style shifter or the E-TransControl RockerBox and hit the UP or DOWN shift. It will return to Automatic mode if no manual shifting signal is received after 1 minute.

Included in the Kit:

• TCM-425 High speed controller
• UI-240 Monitor and Programmer with 3 mounting methods. The included Tilt Mount, Flush Mount or the optional 2″ (52mm) Gauge Kit.
• Wire harness from the controller to the transmission 6 foot in length (plug sold separately).
• Full Color wiring diagram.
• Complete Setup instructions.
• Unlimited Tech support