Detroit Locker 913A315 TruTrac Differential with 30 Spline for GM 87/8″ 12 Bolt

Features. Helical-style pinion gears. Limited-slip operation. Smooth and automatic engagement – no driver action needed. Parts are maintenance free meaning more time on the road. Validated performance and durability. Efficient safe and sustainable operation. Built on a foundation of excellenceCompatibility. GMSpecifications. Material: Steel. Cover Bolts: 12. Axle Shaft Spline: 30. Gear Ratio: 3.73 U Ring. Weight: 25.5 lbs