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Our Big Boy 4 speed is still one of our premiere transmissions. When exceeding 3 speeds, this transmission is primarily used for Land Speed Racing. This trans is available in multiple configurations and combinations to fit a variety of needs. Also available in 2 speed, 3 speed, 5 speed or whatever number of speeds you may need. It is not uncommon for this transmission to live behind well above 3500 horsepower with unmatched reliability and performance.