well today i went to auto zone to get some transmission fluid and oil. i got mobil 1 synthetic automatic tranny fluid, and mobil 1 tri-synthetic motor oil (5w-30). tomorrow i am having my mechanic service my tranny and change my oil. he said it would cost $133 to change the pan gasket and filter in the tranny and change the fluid. well i was just wondering if anyone has ever noticed a difference in the way your car drives, or shifts after you get the tranny serviced. My car has 83K miles and i'm pretty sure it's never been done.