Speedmaster Traction Drive Systems axles are produced using state of the art equipment and manufacturing techniques. We constantly strive to improve the processes and we stand behind the quality of Speedmaster axle shafts. These forged steel street axles are non-tapered with hardened bearing seats and machined to fit a variety of applications. These axles are available in any length up to 34 inch, and if you choose to narrow your rear-end at a later time, these axles can be shortened to suit. Recomendation: When used in Ford 9" Differential our recomendation is to use 1x 34" long axle and 1x 30" long axle.