GRIP LS Ford 9in 31 Spline

The GRIP LS Ford 9in 31 Spline is a performance limited-slip differential designed for Ford 9-inch rear axles running 31-spline axleshafts, making it essential for street machines, drag cars, and high-horsepower muscle vehicles that demand better traction off the line. If you're building a hot rod, restomod, or performance truck with a traditional Ford 9-inch housing, this differential replaces the open carrier to deliver controlled power delivery to both rear wheels simultaneously. The POWERTRAX GRIP series fills the gap between open differentials and full lockers, giving enthusiasts the traction needed for burnouts, launches, and cornering without the extreme engagement or maintenance of a spool.

The GRIP LS unit employs a friction-based limited-slip design that automatically biases torque to the wheel with the most traction while allowing slight differential rotation during cornering, preserving drivability on street applications. Built specifically for the Ford 9-inch 31-spline platform, it mates directly with existing axleshafts and housing internals without requiring custom fabrication or bearing replacement. The aggressive friction pack tuning in the GRIP series ensures consistent, predictable engagement across varying load conditions—whether under steady acceleration, hard cornering, or sustained highway cruising—keeping both wheels working together when traction matters most.

Builders choosing the GRIP LS Ford 9in 31 Spline benefit from plug-and-play installation that requires minimal downtime compared to full rebuild options, with no additional modifications to driveshafts, axle tubes, or suspension geometry needed. This differential thrives in street-driven hot rods, classic truck restorations, and performance vehicles where launch traction and cornering stability trump maximum locking intensity. Weighing 17.66 lbs and engineered to bolt into any Ford 9-inch carrier with 31-spline internals, it represents a cost-effective upgrade over complete carrier swaps while delivering measurably improved traction for weekend warriors and serious drag strip competitors alike.