nah those are only "anti-wrap suggesters" 
it need to be able to move because as the rear axle droops it swings backward, so the anti wrap also has to swing. You can sleeve it, if you dont like the idea of a shackle. Works like a drive shaft but no splines. And if you do that you dont need heims, because the twist is eated up by the slip, you can just use regular ol'bushings.
it need to be able to move because as the rear axle droops it swings backward, so the anti wrap also has to swing. You can sleeve it, if you dont like the idea of a shackle. Works like a drive shaft but no splines. And if you do that you dont need heims, because the twist is eated up by the slip, you can just use regular ol'bushings.