Full Spool Ford 8.8in 31 Spline

The Full Spool Ford 8.8in 31 Spline from MOTIVE GEAR is a high-performance differential spool engineered for serious off-road enthusiasts and performance drivers who demand maximum traction and predictable handling. This full spool replaces the standard open or limited-slip differential in Ford 8.8-inch rear axles, locking both rear wheels together at all times to deliver unmatched grip during acceleration, cornering, and challenging terrain. Whether you're tackling rocky trails, drag racing, or pushing street performance limits, this spool transforms how your vehicle handles power delivery.

Manufactured from durable steel with a 31-spline design, this spool is built to handle sustained high-torque applications without flex or slippage. The full spool design eliminates the weaknesses of open differentials—which split power unevenly between wheels—and provides the mechanical simplicity and reliability of a true locking mechanism. At 8.85 lbs, it integrates seamlessly into the Ford 8.8-inch differential housing, maintaining OEM dimensions while drastically improving traction characteristics. Steel construction ensures longevity under extreme conditions, making it the preferred choice for competition vehicles, heavily modified trucks, and serious enthusiasts.

This spool is ideal for single-track driving, drag strips, and vehicles that prioritize acceleration and straight-line traction over street maneuverability. Installation requires a competent technician familiar with differential work, as the spool must be carefully fit into the Ford 8.8-inch carrier assembly. Once installed, it provides the locked-axle traction that transforms off-road capability and eliminates torque-induced understeer during hard acceleration. The 31-spline tooth count ensures compatibility with all Ford 8.8-inch applications and provides optimal engagement surface area for reliable, long-term performance.