Ok, so I bought my first Mini Cab. Its a 4wd, 3 spd. I had it home for 30 mins and found her stuck in the mud. In trying to rock, softly, it popped out of reverse.Now I have o hold it in gear to reverse, and only on flat ground. Do I need a new tranny, or can I open it up and replace a gear? and if so, where do I find either one, and do I need anything special as far as tools to switch it out? Thanks!