Ditto on/with the advice from Anita - I would check the electrical
connections and components first - that is provided all fluids were replaced, etc.
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I had an 89 Pathfinder that had similar symptom(s) .......... it initially appeared the transmission was done ......... I was able to get it to a dealer ......... they were stumped ......... a quick check of the electrics showed no problems ....... so a few mechanics were convinced the trans was the problem ......... but the problem did turn out to be electrical in nature ..... some sort of connection or relay .........
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there may be a few VX owners on this board than can help - many are not afraid of water crossings ..........
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good luck ......