2000 Hyundai Sonata GLS 2.5 transmission problem
 

Hi, I'm new to the site. I have a problem with the transmission on my Sonata. It would up shift fine but out of no where just downshift very hard. When i ran the codes it came up with the input and output speed sensors. I changed both of them and the problem was still there. The codes for those sensors haven't come back on since i changed them though. Any help would greatly be appreciated!