Transmission dose not get overdrive/high gear. Speedometer low false speed. on 2000 Chrysler Sebring

My car does not shift onto high gear while meter shows I am traveling only 30 mph. But I am going 55+ mph.3000 rpm Was told by transmission that until false reading issue is resolved, the trany will continue to not know it should shift. I stuck in two new speed sensors. The speed sensor incoming and out going sensor. Still not working.

Asked by for the 2000 Chrysler Sebring
poss bad speed sensor,get free diag and est from aamco
Replaced speed sensor. both incoming sensor and out going. Still reading 30 mph at over 60 mph