wut would cause my transmission not to shift normally while n overdrive?sensors?

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it shifts fine manually so I don't thinks its an internal problem! so wut sensors, modules or other components can I replace to see if it corrects this problem? I even was told it could be a dirty filter or fluid? but I truly believe its something simple and external!! PLEASE RESPOND TO THIS I HAVE LOW INCOME AND REALLY NEED TO REPAIR THIS PROBLEM TO ENSURE I HAVE A DEPENDABLE VEHICLE TO PROVIDE INCOME AND TRANSPORTATION TO MY FAMILY! THANK YOU Waco Shane Wiggins 937-380-5252. P.S. Please Help...