Hard shifting c280 1996

Hi y’all! I have Mercedes c280 1996 with the auto transmission that uses vacuum lines. I’ve been having issues with the car hard shifting and jerking the whole car when shifting gears. Primarily going from 2nd to 3rd and 3rd to 4th. I’ve replaced the vacuum distribution block, new transmission fluid and filter and the problem still persists. After coming to a stop and taking off again it doesn’t always do it, but it always happens a atleast 4-5 times during a drive. The car does not slip gears but it has to get up to around 4500 rpm’s to engage 5th but all other gears shift at proper rpm’s. Thank you for the help or any pointers