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Q: transmission does not shift into overdrive on 1991 Dodge Ram Wagon B350

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
transmission does not shift into overdrive. the light in the switch is off, pushing the switch in does not change anything, is there a overdrive switch relay that could possibly be bad. If so where is it located?
(2) Answers
I have the same. Overdrive trouble could be solenoid left side trans above park/neutral swicth, Trany temp switch I have not located, coolant temp I have not checked and speed sensor that I changed. CC don't work
i just had a simuliar problem with my toyota highlander, I flushed the transmission fluid and change the filter if your car has one. THen I put a a lucas oil conditioner and Im good