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.Additional Attributes:GTIN:00883584320517Material:SteelSpline Quantity:30Color:BareHeat Treated:YesGrade Type:PerformanceMounting Hole Quantity:10California Proposition 65:NoExtended Information:Emissions :CARB EligibleLife Cycle Status:Available To OrderPackaging:Quantity of Each:1.0Package UOM:EADimension:8.0000 x 7.0000 x 8.0000 inchesWeight:7.8000 PG