Yukon steel spool for Ford 9" with 31 spline axles

Yukon steel spool for Ford 9" with 31 spline axles. Yukon performance spools are made from the highest quality materials to ensure high strength and long life in performance applications.. 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.