Home Fifth Gen Mustang 2013 Ford Mustang 2013 Ford Mustang Axle Information & Ratios 2013 Mustang and Shelby Axle Data Axle code on B pillar Axle ratios & type BB 3.73 CC 2.73 Locking manditory on GT automatic transmissions DD 3.55 locking Std. on manual transmissions GG 3.31 YY 3.15