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131 0506 Low 12 Z

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The valve body is actually the heart of an auto-box, as the different valves, passages, chambers, accumulators, and the like direct the rest of the transmission in its chores. A standard shift kit includes a separator plate and various other parts for firmer shifts, but a quality trans builder usually has his own tricks and tips after that. However, most of these are proprietary in nature, so get to know a good builder and see if you can pry the secrets out of him!

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