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LS-powered vehicles are known for their dominance on the street and strip. The factory 4L60E in late model GM vehicles can only handle so much abuse, especially in frequently raced applications. The new 4L60E Transbrake Transmission by TCI® gives LS racers the best of both worlds by integrating a Pro Tree transbrake for aggressive starting line launches into a fully automatic 4L60E. Beefed up clutches, bands and steels greatly increase the overall shift characteristics and allows it to easily handle up to 650hp. No modifications are needed, simply bolt-in to your late model Camaro, Firebird/Trans Am or retro-fit application (requires TCI® Transmission Control Unit, 377500 & Wiring Harness, 377502) and get ready for lower ETs.