Check to see if there is a vacuum actuator to put th e gearbox into reverse. Had a similar problem where it wouild go into 5th and rev, but no move.
What was happening is that the vacuum hose itself was old, and getting soft, and collapsing under the vacuum. When the engine was warm, it shifted normally, but within minutes, the hose would be soft enought to collapse and the actuator could not operate properly.
Took me forever to figure out, but all it was is replace the vacuum hose to the actuator on the transmission.
Hope helps.
Doug
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Sunday, August 13th, 2006 AT 8:09 PM