go to the dealership & ask them , If they dont sell them . go to mopar they sell everything.
If it is a 3 speed automatic it is TH125/TH125C/3T40 If it is a Manual it is a Getrag F23
It is a TH125C(3T40) 3 speed.
Two automatic transmissions were available in 1986. Three speed automatic (says PRND21 on shift indicator on dash on console) is a Turbo Hydramatic 125C (TH125C). Later models it was called the 3T40. Four speed automatic (says PRN@D21 on shift indicator, and says "AUTOMATIC OVERDRIVE" in tinier letters over that) is a Turbo-Hydramatic 440-T4. Later models had the 4T60 which is a different transmission entirely.
Check the gas filter it could be plugged (The gas filter has been checked and recently changed, because that's what we thought was happening.. but did not fix the problem.) Does anyone else have suggestions on what this problem might be? Your torque converter lock up clutch (TCC) solenoid is sticking. This is common on these cars and others with the TH125C transmission. The part costs about $40 and the gasket another $5-10. You can change the parts in your driveway in about 90 minutes.