This recent thread describes what I went through a couple of weeks ago:
http://www.automotiveforums.com/vbul....php?t=1087466
At the conclusion of that thread, the problems were gone. In a matter of just a couple of days, the 2 to 3 shift flare problem reappeared.
If I accelerate gently and keep the rpm down to about 2500 or less, I get a normal shift from 2 to 3 and I can then accelerate with vigor without any apparent problem.
If I accelerate the way I normally drive, at the 2 to 3 shift point the transmission misses the shift and I have to let off the throttle for a few seconds and wait for 3rd to engage. I usually see no codes, but once in a while P0758 reappears.
Both solenoids A and B have been replaced, as described in the thread referenced above.
More symptoms, and maybe this is a vital clue: the 3 to 4 shift is fine, but I've noticed that lockup takes a while to occur. When locked up, I normally see almost exactly 2000 rpm at 70 mph. I am seeing about 2150 rpm at 70 mph until lockup finally takes place, but I can't say exactly when it does happen---I have to watch the road now and again.
Could I have another bad solenoid? I really don't think there are any bands or clutches going out because once they engage properly they seem to hold up to the torque. Could it be something other than one of the other solenoids? I understand there are a 3-2 solenoid and a pressure control solenoid, but I don't know enough about their purposes to decide that either needs to be replaced.