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For those wanting great durability and another gear above fifth, the Tremec T-56 six-speed transmission is the way to go. This gearbox has two speeds of overdrive: .80 and .62. It's the same transmission used in the '00 Cobra R and '03/'04 Cobra Mustang. It is available in the Ford Racing Performance Parts catalog with either a modular or Windsor bellhousing bolt pattern. This makes it a great candidate for installation into a classic car. The T-56 with the Windsor bolt pattern is Ford part number M-7003-H and has a list price of $2,250. Different aftermarket versions offer improved torque handling capacity. For example D&D Performance now offers a T-56 to fit behind a 289-351W that will handle upwards of 650 lb-ft of torque.