auto trans whining when changing gears
 

hey i was wondering if this happened to anyone but my automatic trans is acting weird rarely its been slipping when is on D its like it doesnt want to catch into gear mainly happens when im driving really slow and when i put it on Manual mode and i change the gears from D to 1 or any gear change it does a whining noise but it only does it when its on manual mode it also has been sluggish lately im doing a fluid change and filter change Thursday is ther anything else i should be thinking about doing to it? or should i stay with the fluid change for now and see if it does anything to it?