Backward Roll in Neutral?
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every automatic does that. there is slip from your torque converter and clutch discs inside the automatic when the engine is at low rpm/idling. if there wasn't any slip, your engine would be forced to stop turning at every stop. if you are on level ground, the van should creep forward. the weight of the vehicle on the hill is enough to overcome the little bit of friction at the low rpm and you roll back.