There's no point in just swapping out the axle shafts in the 35 unless you go to the 30 spline axle. To do this you would also need a 30 spline Detroit locker, or tru-trac, some carrier that would except the 30 spline axles. So then you have the super 35 and the cost.
1987 wrangler, 258 I-6, 5-speed.
2007 liberty sport 4X4, automatic
2009 ford ranger 4x4 FX4 OFF/ROAD, 5-speed