That's weird our 2005 Ranger 2.3L Auto NAPA delivery truck has the same 2-3 flare up on it and it never fails. The 2-3 shift under moderate to heavy throttle flares up on that shift.We are also experiencing some weird tyranny shifting when its cold. It will shift a but hard from 1st to 2nd and have a weird little flare between 2nd and 3rd, but seems to go away when the weather is warm.