A while ago, someone wrote a post on how he would like to lock up his diffs, rather than having the slip diff set up. Since that post, I've been thinkiing of a way to do it mechanically rather than stuffing the diff cup with clay. In my mind, I figured out a way to do just that, and I could make one this winter. My question is: what would be the advantage to locking the rear diff on my Emax (if any)? And, would it be better to just lock the rear, or should the front be done as well? If there is an advantage, and I did make a mechanically locked diff; I would eventually post how to do it...if you guys would be interested.