I would check for burnt fluid perhaps, has it been changed? unless its something like a external valve module and its a simple fix Do not get it rebuilt. There is a very high failure rate on auto tranny rebuilds. Yes it can be done and you can pay a ton on something backed with a good warranty and maybe that fits the budget and the outcome. I would however find a good used transmission change the filter and fluid a lot and go that route. Might be worth a 60-90 fee to take it to a trans shop and really find out what the deal is.