If you have a friend to help you then you can have that transmission out, on a bench, and completely disassembled while the engine is still relatively warm. I had mine out three times to rebuild it. I couldn't find anyone to rebuild mine so I did it myself. My first suspicion is a severely worn 3-4 shift sleeve and synchros. My best advice is to go buy a reman transmission with a warranty. If that is not an option, then PM me. I have an old Quadractec here that has a full exploded view diagram of the AX5. To my knowledge, they stopped printing these. I was never able to source the shims that I needed to properly rebuild mine, so I pulled it out and readjusted it three times until it was "close enough". Wasn't the most awesome way to do it, but it worked. That Jeep was a trail slut anyway. Keep me in mind if you have further questions. I got very familiar with the AX5 during that time.