Take your high-performance build to the next level with the TCI 6X Six-Speed Transmissions and Packages—advanced drivetrain solutions for enthusiasts who demand premium strength, smooth shifting, and exceptional control. Whether you’re building a street machine, drag car, or pro tourer, this lineup delivers serious capability.

The heart of this system is the tci 6x transmission, built off the trusted GM 4L80E foundation but reimagined with six forward gears (2.97, 2.31, 1.57, 1.18, 1.00, and 0.75 overdrive). It incorporates a new valve body and extra shift solenoid, allowing tighter step-ups between gears for better acceleration and more efficient highway cruising.

Look for the tci 6 speed 4l80e packages when you want both brute durability and modern driving comforts. These kits are rated to handle up to 850 horsepower in standard form, with options for even more beef in high-output builds. They include essentials like a TCU controller (EZ-TCU), wiring harness, oil cooler, bellhousing, flexplate, and all necessary hardware.

What sets the system apart is its flexibility: choose automatic or manually shifted control, select from Ford, GM, or Chrysler engine compatibility, and match cooling and shift behavior to your driving style. The tci 6 speed automatic transmission solutions here give you great downshifts, reliable launches, and strong highway manners.

If you want a transmission that works as hard as you do—capable, customizable, built strong—this package delivers. Add it to your build and get shifting precision that moves with you.