Yukon 4340 Chrome-Moly Right Hand Inner Axle For 79-87 GM 8.5 Inch Blazer And Truck Uses 5-760X U/J Yukon Gear & AxleYukon Gear and Axle offers an extensive line of general replacement and high performance axles for passenger car, truck and SUV applications. High quality alloys and the latest in heat treating technologies provide a strong axle for off road, on the street or at the track. Details: Yukon 4340 Chromoly RH inner axle for 1979 1987 GM 8. 5 inch Blazer and truck Fits 1979 1987 GM half ton front with GM 8. 5 inch Right hand side inner 28 spline 19. 15