The Yukon 4340 chromoly right-hand inner axle for 1979–1987 GM 8.5-inch Blazer and truck applications is a replacement front inner axle built from high-tensile 4340 chrome-moly with cold-rolled splines and advanced heat treating. It uses 5-760X series U-joints, measures 19.15 inches long, and features a 28-spline shaft to match GM 8.5-inch differential fitment and restore reliable service.
Yukon Gear 4340CM Right Hand Inner Axle For 79-87 GM 8.5in Blazer and Truck / Uses 5-760X U/J