These Ford Racing Torsen differentials use a worm gear friction system that will not wear out like conventional clutch-type positive traction differentials. These differentials ensure your engine's power is transferred to the wheels with the maximum traction. The unique torque-sensing ability of the Torsen design, and the smooth engagement of Torsen-style limed slip differentials, make them the perfect choice for your street, strip, or off-road vehicle. This Part Fits: YearMakeModelSubmodel2004-2014FordF-150FX42006-2008FordF-150Harley-Davidson Edition2005-2017FordF-150King Ranch2004-2017FordF-150Lariat2011FordF-150Lariat Limited2013-2014,2016-2017FordF-150Limited2009-2017FordF-150Platinum2016-2017FordF-150SSV2004-2014FordF-150STX2008FordF-150THE 60TH ANNIVERSARY EDITION2004-2017FordF-150XL2004-2017FordF-150XLT