1999 mercedes c280 has trouble shifting between 3rd and 4th gear
To date I have replaced the valve body, conductor plate, the 13 pin connector, the filter, and transmission fluid. The car does shift much better, except for the shift between 3rd and 4th gear. It often feels like it's hesitating, and the rpm's increase until it does shift. It also seems to be more noticeable when the car is warmed up. I would appreciate any thoughts or suggestions that you may have.
Thank you.


