Fits 2005-2014 Mustang GT and 2007-2014 Shelby GT500 with 8.8-inch axle and 31 spline Fits 8.8-inch axle with 31 spline 8.8" Torsen differential 2.7 drive bias ratio 31 spline Features full-time torque-sensing, torque biasing differential Standard on 2012-2013 Boss 302 Mustang Laguna Seca package Will accept anti-lock exciter ring Does not fit IRS applications