MasterLine driveshafts are custom built from 4" x .125 6061 aluminum tubing and include the MW Billet Trans. yoke of your choice. Spicer precision, lubed for life, u joints are used for longevity. Special assembly fixtures guarantee proper weld yoke phasing during assembly. Every shaft is electronically high speed balanced considering the customer´s maximum RPM requirements, with the transmission yoke to ensure vibration-free operation. The shaft price includes the MW Billet transmission yoke. A hardened yoke for the needle bearing tail housings transmissions, (Dedenbear, Liberty, Jerico) is available for an extra charge. Check service bulletin # 0049 for operating limits and critical speed charts. Refer to our Driveshaft Set-Up and Measuring Tips for help gathering your dimensions.