As far as I know, as from what the previous owner told me, he never changed the transmission fluid or filter. Thing with this is that since this started happening like it is now, it isn't getting any worse. It's not getting any weaker like I suspected it would. I'm delivering pizza in it driving approx. 100 miles/night and have been driving it like this for the last 2 to 3 weeks with no problem. Also the car only has 96k on it.