I've had my Mazda 3 for about a week now and when I got it I had no problems whatsoever. Its a 2007 2.3 auto with 67000 miles on it. Now it feels like the transmission is shifting harder (especially from 1st to 2nd) and doesn't shift until about 2500 RPM's even when I'm driving soft. I checked the ATF and noticed it was about an inch higher than the fill mark could this be the problem? I'm going to drain some anyway. What do you think?