We had Spidertrax custom-make our axleshafts out of 300M chromoly. This high-tensile alloy is much stronger than normal axleshafts. Plus, these axleshafts are machined to length at Spidertrax's facility in Colorado, not overseas. Notice how the axleshaft is turned down after the splined section. This offers optimal shaft torsional twist and reduces the stress on the splines.