8.Once the third member was installed, Toby finished up the front-axle assembly, installing a new set of Longfield Super Axles. We picked these units for several reasons: They retain the stock-style Birfield design and allow up to a 48-degree turn without the annoying steering feedback commonly found with U-joints. They also are said to be the strongest Birfields made. Constructed of 4340 chromoly and 300M steel, they feature smaller balls to allow for a thicker bell and cage. The shafts are also made from 4340 chromoly, and instead of using the standard 27 splines at the Birfield, they use 30.