4340 Chrome-Moly left hand inner axle for '69-'80 GM Blazer and truck, Dana Spicer 44 with a length of 36.13" and 30 splines. 4340 Chrome-Moly axles provide up to 50% increased strength over stock axles for use in extreme performance applications with large tires and high horsepower. 4340 axles are manufactured using the latest technologies and the highest quality materials to ensure high strength and long life. Limited Lifetime warranty covers manufacturing defects and axle breakage for as long as you own the vehicle. This warranty is not transferable to another party. “No Questions Asked” replacement for first warranty return. Uses 5-297X OR 5-760X U-JOINT