you most likely have a faulty output speed sensor,or input speed sensor,these send and receive information from the pcm to control trans shifting and speedodometer action.you probaly have a check engine ligth on with a code of p0500,you can buy these parts over the counter at any parts store make sure to get the codes cleared,you can do this by disconnecting the battery for ten minutes
both of these components are located front side near the bottom of transmission
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