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Check your Vehicle Speed Sensor. Just replaced mine. My 95 JGC 5.2L would not shift into overdrive and was running 50% higher RPMs. Parts are cheap($50-$60 sensor & housing adapter) and repair is easy (30minutes) if you get the same connector. The sensor is on the back end of the transfer case near the drive shaft to the rear wheels. If I remember correctly, it is error code 15.
To check for the error code, turn your ignition On-Off, On-Off, On then count the times the Check Engine Light blinks. There are short pauses between digits and long pauses between multiple codes. The last code it will give you is 55 which means that is the end.
Good luck,
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