Tranny wont go into 2nd

Hi, when you changed fluid did you change the filter, too? Allthough what you are describing sounds like you might need to change your modulator valve. These aren't very costly and are easy to change out. That's what I would be looking at next. I think it just might take care of your problem. There are adjustable ones that you can set to shift earlier or later as you see fit. Also I would double check and make sure I had enough fluid but not overfull. Too much can make them act really funny sometimes, too. Good luck! :D