I have a 97 Jeep Grand Cherokee Limited. The OD light comes on when it's cold outside and won't shift correctly until it goes off. Sometimes I can make it go off if I drive it some, then shut it off and restart it but not all the time. Sometimes I have to drive it 6 or 7 miles and it will shift itself.
Calvin...... You need to treat your Jeep to a new THERMOSTAT. The Overdrive is connected to the engine coolant temperature and if the engine is n ot warmed up properly, the Overdrive will not engage. Try to get a thermostat from the Jeep dealer so you will have exactly the right one, some of the cheapoie ones will not work right. Dave in Iowa
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