I beleive he is talking about Revolver shackles from Teraflex. I have friends that have run them on Jeeps for some time, on the front they don't work very well..they unload when climbing. On the rear, they found excessive wheelhop. I guess if you don't have to do any hard climbing, they flex awesome. As far as a sammy is concerned, I have run the missing links from Trailtough, they were awesome, except on pavement. Even with polyurethane bushings in the springs, they wandered something fierce. If you could control the wander, they would be great.