TCI’s latest version of the 6X 4L80E trans can handle a whopping 850 hp and a great gear spread designed for quick acceleration and better fuel mileage. This transmission can be button shifted too, making it a blast to drive, whether you’re just cruising around town or heading down the quarter-mile.

Official Release:

Based on a GM 4L80E, the 6X gives you six forward gears (2.97, 2.31, 1.57, 1.18, 1.00, and 0.75 overdrive) for quicker acceleration and increased fuel economy at cruising speeds. The transmission comes with TCI’s EZ-TCU transmission controller to give you control over shift points, plus your choice of an Outlaw two-button shifter or a paddle shifter for full-manual shifting. Unlike automatics with an add-on overdrive unit, you can stuff a 6X anywhere a standard 4L80E transmission will fit.

TCI tests each transmission on a hydraulic tester valve body dyno and computer-controlled transmission dyno to ensure proper line pressures and transmission performance.

The TCI 6X 4L80E Automatic Transmission Packages include the transmission and bellhousing, EZ-TCU, Outlaws shifter, a paddle shifter, wiring harness, dipstick, and transmission cooler. TCI even includes three gallons of Max-Shifter transmission fluid. The 6X package is also available without a shifter.

Features:

• Six forward speeds
• Works with an electronic transmission controller
• Based on the super-tough 4L80E
• Upgraded internals