I have a 03 sebring 2.7.automatic ,just had the trans axle and wheel hub assembly replaced, just had to add 2 quarts of trans fluid everything works fine.problem when i slow down from 35 mph to a bout 15 or 10 the transmission down shifts hard.any ideas.Thanks.

 

Could be the trans computer is re-learning and will smooth out after a while. If it doesn't, take it back to where you had it done and have them check for electronic and hydraulic issues via proper diagnostics. No point in guessing.