Here's the new set up for my Kraton. I have rpm a arms, hot racing bulk heads, diff cups and hubs. Along with voltage hobby suspension mounts. I was going to return the rear rpm a arms but decided I would just carve them out to make them work correctly for now due to binding issues. I also want to say in the past I've tried to use the front drive shafts on the rear but there seem to be too much binding. But with this set up it leaves enough room in order to do so.