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Can you use park, neutral, or reverse? If so then your tranny is in limp mode. The only gears that work are 2nd and reverse. Check the cable to your tranny and see if it is plugged all the way in. If it is then you have other electrical problems and need to have your truck looked at.
I'm not sure if an 89 still has a vacuum modulator on it or not. If the vacuum line to it is off it will only shift after over revving it. Can you shift it manually? Start in low and shift at the proper RPM?
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