Jason, When you do make up your mind about your tranny, I would start looking for a double cover IRS box. They have a rev. gear that is a little stronger. You also could go to a type-2 like a lot of guys do. They have the benefit of much lower gearing and are very tough. Cost more money,but I think they are worth it. It really is how hard you want to play. If there is going to be one car in yard that is going to be perfect it would be the Buggy/rail. You haven`t lived until you try to tow/drag a wounded Buggy 20-30 miles through creeks, rocks and over mtns with another Buggy. Been there done that. Off road riding losses its charm when this happens.