hi i have problem with my baby Benz its an 190E 2.0 87kw with automatic transmission. The problem i have is that tranny doesent shift into 4th gear.

car starts then it shifts into 3rd but it wont shift into 4th eaven when its 5000rpm and more and speed is 80km/h (50mph). i have changed oil and filter, taken valve body apart and cleaned it but no shange. PLZ help me