I had my AX15 rebuilt in December 2011. I could tell afterwards that it was very tight and would grind when going into second gear. I figured I would drive it for a few hundred miles and it became a lot easier to shift. I also noticed that when it was easier to shift it was 90-100+ degrees outside. We had a crazy cold front come through Texas this week dropping temps to 70's. Now the trans is starting to grind a little again. Should I do a gear oil change? What gives? Not sure why the lower temps affects it so much.