XB4 solid axle – slipper eliminator is fantastic for stock program battle since it enables you to reduce maximum rotation mass and eliminates slipper effect. Really really helps to increase acceleration also reduce fat of drivetrain. The XB4 solid axle – slipper eliminator set contains lightweight shaft with easy and quick change outdrive system. Set includes 72 spur gear which is a good match for stock course. Option 69 spur gear can be acquired for fine gearing modification.