the fast guy at my track runs an AE 4x4 and used grid irons soft on all 4 wheels. He does not use a locker or C diff or 2 stage pistons and uses a stick pack. He is like WC and AE stock. So it might just be like people say. in the hands of a good driver the truck is fine, but in my mortal hands, it needs a lot of work. heck the fast guy does not even use lead in his truck or exo chassis.