I bought a 00 SE about a week ago. The guy said the trans will shift normal until it is warmed up. Then in every gear it shifts hard, real hard. I heard it could of been my shift solenoids but was just wondering what all could be causing this before I start throwing parts at it and/or condemn the tranny itself.

Changed fluid and filter is all I have done to it.
203k miles on it
was supposedly rebuilt at 100k but I got no paperwork saying so.