i have a 2000 with an auto. when i take off slowly, sometimes it feels like the tranny shutters 3 times when shifting into 3rd. also sometimes when i am about to stop at 2 mph, i feel a light downshift or shutter. i saw the tach go up and down slightly a few times when shifting into 3rd the other day and without the shutter. is this a failing tranny or are these trannies like that with the light shifts that it has. the odometer says 40,000 on it and the fluid looks good.