02 Cavy shifting problem

I have a minor problem. I got in a car accident bout 3 months ago and i had the radiator and bunches of other stuff replaced. My car leaked not quite 2qts. of tranny fluid and i didnt realize it. I filled it back up to the apporiate lvl. Bout 1 month ago, when it shifts into 2nd gear when its cold it feels like wheel hop but the tires arent spinning. And now when i get on it it shifts into 2nd but it is like a delay first it revs down then u can hear the engine rev a little and then 2nd gear kicks in. O and by the way this is on a automatic 4speed tranny. If ne1 knows what could be the problem it would be much appericated if u could let me know...
thanks

i posted this in the main section and no responses so i figured this my be better.

Did you add the fluid while the vehicle was running and checking the fluid level according to the service manual, Also are you sure its no leaking still?.

John

yes i did and it still slips. Also i put it up today and poured very little in and the tranny fluid that came out was blackened like dirty oil would be.