i have been posting this problem on gmfullsize the whole time i have owned my truck! even with all the crap turned off it seems to limit you. and those guys act like im a idiot. i as well have noticed i can power break it, let up slightly on the brake and it's like something releases and i can smoke them all day without traction control or anything getting in the way. how ever if i am in the mud or wet grass the thing goes nuts even disabled. it is def. a strange system...