You need to have t h e transmission computer checked for codes.
The transmission computer will default to second gear only when it detects a malfunction and sets a code.
You need to check the transmission computer for codes to know possible causes.
A 1992 Oldsmobile may not shift out of park because the transmission is stuck. Check to transmission fluid to ensure it is at the proper level.
Inside the transmission.
If the transmission won't shift out of first gear on a 1992 Buick Roadmaster, it could indicate the transmission gears are seized. It can also indicate a low fluid level.
faulty speed sensor in the transmission
it may b the transmission sensor
Overdrive might not work on a 1992 Dakota because there is a problem with the transmission. The shift solenoid or a belt is not functioning properly inside the transmission.
I believe it is on the passenger side of the transmission ( A4LD ) behind a heat shield
maybe your transmission is going out or you dont have sufficent transmission fluid.
LOOSE OR CORRODED ELECTRICAL CONNECTION?
automatic trans fluid 4 (ATF-4) its for Chrysler