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129 0505 Tran 04 Z

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Practically everything that takes place inside an automatic trans is done with hydraulic pressure, so it makes sense to have the best pump possible. This '98-and-up GM pump features 13 vanes, compared to earlier models' seven- and 10-vane pumps. The result is more pressure (where desired) and a higher flow of up to 7 quarts per minute.