Hard shifting into 2nd and 4th TAAT
 

FYI. If you have hard shifting into 2nd and 4th without reverse slam try replacing your Throttle Position Sensor 1st. My 1997 SL1 was doing it and I went ahead and put a new valve body thinking it was going bad. I had no codes in computer and was baffled on what might be wrong. Then I read about how a bad TPS can cause transmission to shift hard. Replaced it with a new ACDELCO and it now shifts smooth as silk!

That's good information, Chesterboy. Thanks. And welcome to the forum.