I have a 95 GMC K 2500 7.4 with a 4L80E it has 151,000 miles, what happens is the vehicle is stuck in second gear and is setting the DTC 81, 82, 83, 85, 87. Also the instrument cluster randomly stops working, the tachometer and speedometer will drop to zero the shift position light will sometimes go dark and not notify what gear you are in. I need to know where to begin diagnosis.
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