Detroit Locker - Ford 9in 31-Spline 187SL17B

A Detroit Locker transforms your Ford 9-inch differential from a power-splitting liability into a predictable, mechanical advantage on the track or trail. By eliminating wheel slip under acceleration, you'll gain consistent traction and faster corner exit speeds—critical whether you're drag racing, road racing, or pushing through technical terrain. Built to handle high-horsepower applications with zero electronic complexity, this locker delivers the aggressive lockup you need when it matters most.

• Detroit Locker design
• Ford 9-inch housing
• 31-spline internals
• 3.25 ratio and up
• Iron construction
• Mechanical lock-up
• Bolt-on installation
• Sold individually