Yukon Gear & Axle (YA W24122) Replacement Axle Kit for Chevy Blazer/GM 1/2 Ton Truck 30-Spline Differential 4340 Chrome-Moly Limited Lifetime Warranty Performance Axles Axles Made from High Grade 4340 Chromoly Steel for Superior Strength Includes inner and Outer axles and Spicer U-Joints