Detroit Locker - Ford 9in 31-Spline

The Detroit Locker for Ford 9-inch differentials with 31-spline configuration delivers automatic locking performance for serious off-road and high-performance driving. Built as a differential carrier assembly rated for 3.25 ratio and higher, this TracTech locker eliminates wheel spin by locking both axles together under load, ensuring maximum traction across challenging terrain, recovery operations, and track applications where traditional open differentials fall short.

The 31-spline design ensures compatibility with modern Ford axle shafts, while the steel construction provides the durability required for heavy shock loads and sustained high-torque situations. At 14.75 pounds, this carrier integrates directly into Ford 9-inch housings—a platform trusted across truck, Bronco, and custom vehicle builds. The automatic locking mechanism engages instantly when power demand increases, then unlocks smoothly during cornering to restore normal handling characteristics. This type of performance gear is essential for vehicle owners who demand consistent traction without manual engagement or the complications of electronic controls.

Detroit Locker units are engineered for trucks and off-road vehicles operating in extreme conditions—mud, sand, rock crawling, and highway towing scenarios where axle slippage creates safety and performance liability. This carrier assembly suits restoration builds, race-prepped platforms, and field recovery vehicles. The Ford 9-inch housing remains a popular platform for its strength and aftermarket support, making this 31-spline locker a straightforward upgrade path for owners seeking differential lock capability without full housing replacement.

Installation requires basic differential service skills and proper tools; professional service is recommended to ensure correct setup and backlash adjustment. The unit ships ready for assembly into prepared Ford 9-inch housings, with all necessary internal components included.