I havent done it yet. BUT I have a piece of 3/16" steel that I am going to reinforce with some channel and extend it off of my flat tranny skid. It wont keep mud and water out. (You would really have to get creative on that one) But I will keep rocks away from my crank shaft.
It's basically going to be 18" wide and cover up to around the pulley.
89 YJ.. My first jeep and I won't let it go. ▀||||▀
Current Project: None... I disgust myself.
<a href="http://www.jeepforum.com/forum/f22/my-yj-build-adventures-thread-1356941">BUILDING THE YJ MY WAY</a>