Drove over stevens pass once in 2wd only with the spool in the back of my XJ. That was a fun ride going downhill... you just have to keep going, if you let off the gas a little on the slick stuff going downhill, the rear-end would want to swing around the front and it was over. Had a couple close calls on that trip and decided I needed a front ARB instead of the detroit if I was going to do anymore street driving in winter with my rig. 4wd with an open front and spooled rear is actually pretty nice in the snow... very well balanced and sure-footed I thought.