Chrysler has announced that it will be installing the W5A580 five-speed automatic transmission in the 2006 Dodge Magnum and Chrysler 300 that are equipped with the 3.5 L V6. The 42RLE four-speed will remain the sole offering on vehicles sold with the 2.7 L V6. Additional capacity at the Kokomo, IN plant that supplies the Mercedes-derived gearbox is credited with allowing Chrysler to make this change. Claims of less shifting make little sense given the addition of one more gear, and EPA mileage tests don't reflect promises of better real-world fuel economy, but it's a safe bet that the well-spaced ratios and proven reliability of this transmission will ultimately yield a better driving experience for those buyers that somehow resist the temptation of the Hemi.
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