1990 e-350 ford van 7.3 diesel overdrive transmission
Problem is when transmission shifts to high gear in overdrive. When shifting to last high gear it shifts ok, until you let off the trottle which causes transmission to shift back down to next gear. Step down on trottle and transmission will shift back to high gear overdrive. It will stay in overdrive high until you let off the trottle. Does anyone have a similar problem and what did you do to correct it?
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