4L60E (00-03) Heavy Duty/RV Transmission for Truck w/ LS Series Engine.TCI StreetFighter Transmissions are designed to withstand the rigors of street machines ranging anywhere from 400 to 675 horsepower with a non supercharged system using pump gasoline, depending on application. Equipped with a TCI manual automatic valve body, most units allow you to manually shift the vehicle into each gear change or, by placing it in the drive position, remain fully automatic. This gives you racetrack shifts and shaves time off your