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11 When the capabilities of the 4L60E have been exceeded, a 4L80-series or Turbo-400 (shown) trans may fit the bill. These units weigh roughly 75 pounds more but offer a significant upgrade in strength. The three-speed Turbo-400 is typically preferred for cars that primarily see strip duty, while the four-speed 4L80 is better suited to street use. View Related Article
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