The 5R55S transmission is a 5-speed electronically controlled transmission with the Ford SelectShift option that allows the driver to mimic manual transmission shifts. The 5R55S transmission is based off of the 5R55E which is known as the first 5-speed transmission for standard passenger road vehicles. The 5R55S debuted in the 2003 Thunderbird and was later used in 2005 through 2010 Mustangs. See the full Raybestos Powertrain 5R55S transmission parts listing below.