My 300E transmission is starting to shift really badly. Imagine a beginner on a manual transmission that lets the clutch out too fast between shifts and you get that jerking back and forth. I am getting that between gears 2-3 and 3-4 on an automatic transmission.

If I put my foot down all the way and try to drive it harder, the shift from 2-3 is just gone, engine revs and the transmission never catches into third gear. I have to come to a complete stop in order to move forward again.

Is this a sign to replace the K1/K2 springs as well as the ATF fluid and filter? Anything else I need to look at replacing while I am in there?