Yukon Gear Steel Spool For Ford 9in w/ 40 Spline Axles - YP FSF9-40

Yukon Full Spools are a cost-effective way to convert a diff to 100% lockup. Installation is easy as they install in place of your differential carrier assembly. Each Yukon spool is made from high-quality 8620 steel and heat treated for additional strength. A spool is an outstanding choice for dedicated off-road and drag racing vehicles only.

• Provides 100% traction to both wheels at all times
• Not recommended for street driven vehicles
• Fits Ford 9" with 40 spline axles