Customize your gear set and differential with Ford Racing 8.8 Mustang axle kits. You'll receive an axle housing, a housing vent, right and left 31-spline production axle shafts, a Mustang pinion flange, and a Cobra 1350 pinion flange, plus hardware. These axle kits are perfect for building your custom axle. So, do it your way with Ford Racing 8.8 Mustang axle kits. Mustang Axle Kit; 3.5 in. Dia. One Piece Aluminum; 1350 U-Joints; Off-Road Use Only;