TCI has developed the world’s first aftermarket 6-speed automatic transmission. Utilizing the a GM 4L80E, TCI has created an amazing piece of engineering that's capable of handling 850 hp!

The TCI 6-X Six Speed Automatic Transmission gives you six forward gears (2.97, 2.23, 1.57, 1.18, 1.00, 0.75) for quicker acceleration and increased fuel economy at cruising speeds. This versatile transmission fits Chevy Small Block, Big Block and LS series engines and features a compact design allowing it to work in a variety of vehicle applications including pro touring, street or race vehicles. When used with a TCI Transmission Control Unit and TCI Paddle Shifter, you get the most functional and modern drivetrain combination on the market for your vehicle.



Package part number includes TCI 6X Six Speed Transmission, Torque Converter, Transmission Control Unit, Paddle Shifter, Wiring Harness, Transmission Cooler and Dipstick.
6-X Six Speed Automatic Transmission Package - 271600P
6-X Six Speed Automatic Transmission - 271600
Transmission Control Unit - 377500
Paddle Shifter (see below) - 301442
GM 4L60E/4L80E Wiring Harness - 377502

Paddle Shifters For TCI Transmission Control Unit
How often have you wished that your car had options similar to those found on high dollar g-machines and touring cars? Now it can with the new TCI Paddle Shifter.



Designed to work with any automatic 4, 5 or 6-speed transmission controlled by the revolutionary TCI Transmission Control Unit, this shifter features distinctive show car styling and shifting performance that’s perfect for track days or highway cruising.

The TCI Paddle Shifter communicates to the Transmission Control Unit through a wireless CAN signal that cannot be affected by signal interference or disruption. The steering wheel mounted unit operates by slim, 1/2-inch thick paddle shifters, which instantly instruct the transmission as to your gear of choice without hesitation or delay.



This shifter fits all 5 & 6-bolt aftermarket steering wheels and ships complete with several spacers of varying width, allowing you to adjust the steering wheel location to your personal preference. Power for the TCI Paddle Shifter system comes from the horn button relay rather than from batteries, which require replacement and can result in a low power signal.

Paddle Shifter for TCI Transmission Control Unit (w/o display) - 301441
Paddle Shifter for TCI Transmission Control Unit (w/ display) - 301442