SIX-SPEED AUTOMATIC

摘要

TCI's 6X Six-Speed automatic-based on GM's 4L80E, which is itself based on the indestructible Hydramatic Turbo 400 box-is a dream come true for hot rodders wanting a trans with the ultimate in strength, compactness, and efficiency. Through some extremely innovative (and patented) modifications to GM's four-speed 4L80E unit, TCI has made a bulletproof six-speed automatic that can withstand up to 850 hp with no sweat. Starting out with a computer-controlled 4L80E, TCI changes the planetary gearset to alter the gear ratio spread, then applies the overdrive clutches in Second and Fourth gears to fill in the extra gear ratios. Major modifications to the valvebody fluid circuits allow the extra gears to operate, and additional clutches and steels are added to the package to beef up the torque throughput.