Could be the VSS (Vehicle speed sensor)For starters have the PCM (computer) scanned for codes, Autozone will do it for free. If the PCM sees a problem it will store a code that will help in diagnosing the problem, get back with the exact codes. If the PCM doesnt see the truck moving (speedo) it wont let the trans shift
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Saturday, February 16th, 2008 AT 7:14 AM