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Can't even go over 60 up a decently steep hill. My overdrive button doesn't even light up anymore so I don't know if it's on or off. Or if it even works now..
I floor it, it shifts a million and 1 times up, down, up, down. Then just stays a steady gradually increasing speed..
He has a 97. O/D off button is on the dash, light is in the switch. All it does is send a signal to the PCM to suggest that it stay out of O/D. PCM controls the lite. I would start checking wires.
When is the last time you were in the pan of your trans? Could be as simple as changing a couple electrical parts.