With a bulletproof set of gears and a selectable locker to match, the next rational place to focus our attention was the axleshafts. For those who want to run 35-inch-or-taller tires on a model 30 front end, we strongly suggest installing a pair of Superior's Super 30 chromoly axleshafts because they offer vast improvements in strength over stock. The OE axleshafts on the JK Dana 30 feature 27 splines whereas the Super 30 shafts come with 30 splines. Typically, each spline represents an 11-percent increase in overall strength. Combine that with the added strength of chromoly steel material, and you have a much more reliable axle arrangement for your JK.