EcoBoost’s best friend: Ford unveils new 6F-55 six-speed automatic

Filed under: Ford
When Ford debuted its 6F transmission back in late 2005, we were told it could handle up to 300 horsepower and 280 lb-ft of torque. That transmission debuted with the automaker’s 3.5L V6 and both are now widely used together in a number of Ford, Lincoln and Mercury products. Times have changed, however, and Ford has introduced a new version of its 3.5L V6 with twin turbochargers and direct injection. Called the 3.5L EcoBoost, this engine makes more power than the original 6F transmission, now called the 6F-50, can handle. Enter the 6F-55, a new version of the 6F-50 with beefed up internals to handle the 3.5L EcoBoost’s 355-365 hp and 350 lb-ft of torque. One example is the new ring gear on the 6F-55 (shown at right), which is 41.5mm thick compared to 31.5 mm on the 6F-50.The 6F-55 will be used initially in versions of the Ford Flex, Lincoln MKS and MKT that feature the 3.5L EcoBoost V6. It will also be the only transmission available for the new 2010 Ford Taurus SHO that features the most powerful version of Ford’s EcoBoost V6 (sorry SHO fans, no standard transmission will be offered). Each application will also feature SelectShift for manual operating the tranny with either the console-mounted shifter or paddle shifters on the steering wheel. We’ll have to wait for our first turn behind the wheel of an EcoBoost-equipped Ford product to judge just how well the new 6F-55 handles all that extra power, but based on the rather significant list of internal changes detailed in the press release after the jump, the new tranny appears more than capable of handling our heavy left foot. [Source: Ford]
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EcoBoost’s best friend: Ford unveils new 6F-55 six-speed automatic originally appeared on Autoblog on Wed, 18 Feb 2009 12:29:00 EST. Please see our terms for use of feeds.
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